Forgive me any language mistakes. Im from Poland.
Many MMO players fell in love with Razer Naga since it came arround. Everybody knows that for mmo numbers of buttons are most importand and Naga had most. So quickly it become one of the best selling mouses on the market. Other companies smelled nice buisness there, and joined in competition - logitech with his g600 mouse and Corsair with M90/95. But does always usefulness of mmo mouse comes with number of buttons as players think? I doubt about that.
Basic differences between keyboard and mice
Those things may seem obvious but it crucial to understand them well. Keyboard have this advantage that their position is static. This way, we dont need to pay attention about helding it, and proper pointing things. It let us to use all fingers of hand just for klicking keys, nothing else. If we have many free fingers, then we can have many skills under our hand and only thing we need to do is to remember them. This is the only task for our hand (particulary a brain who leads our hand). And we see this is hudge advantage since all players admit that first step to be good player is to stop being a clicker and start to get use to using skills with keyboard. I think most of us agree that this is crucial.
Now, mouse isnt static, is always in movement. It demands helding it in convenient way, so one of the thing we have to focus on while using it, is to keep griping it in proper way. Offcoruse with years of use, we do it automaticly, but nevertheles it demands some part of our mind to get involved. Second thing (and most important one) our mind have to do is to point things. So we have now 2 tasks to do, binded to our hand.. Third thing we have to do is to click proper keys. And this is most interesting because there is many of them and mind have to remember their skills and placing. As we can easy assume now, the more we have skills on them, the more tasks we have to remember for right hand. So we have to keep the mouse in hand (which probably seem not involving), point things precisely and remember all skill and their placing. Its easy to remember them when we have 3 or 5 additional buttons. But managing all those tasks when we have 12 additional buttons is not such easy task.
Someone can say "after weeks of using you can learn to manage them easily". Yes you can remember them well, but the truth is, that you will never be able to remember them so fine, like only 5 or 6 additional ones. Difference may seem slim in time, but it exists.
Someone other can say "but you have to remember keyboards skill as well, so there is no difference - work is the same". Placing fewer buttons on mouse has another advantage - ease of accesibility. You can put there most important skills and you can mix them with another mouse advantage - pointing things. When you bind most important skills in "point and skill" macros then you can have easy accesible and remember skills, which are more worthy in "heavy" situations than having tons of them.
So my first statement after this paragraph is that If you trying to make a keyboard from the mouse, in fact you lose the best advantages of second one.
Trap of false ergonomics.
Many Naga/G600 users claim that its very easy to remember skills placing, because they are all placed in one area under one finger. Well i think it is more complicated than they think.
First problem ,is that thumb is not the most flexible and precise finger of our hand. Aproximately we can assume that most precise is index and middle one, thumb is third and two other are the least precise. So thumb not leads here, but nevertheless it has most work to do on G600/naga mouses. Many g600/naga owners say that this is advantage, because as i wrote before, thay can easier to remember skills and manage them. But the most importand thing to understand is, that ease to remember doesnt always come with the best ergonomics. I'll take keyboard typing learning as most obvious example . The easiest way to type on keyboard, and the most common one of starting using it, is to type with two index fingers. The only thing we have to do is to rember buttons placing (which is very easy) so after awhile we can type quite fast. But offcourse this way, is no the best one as as we know. Downside of this, is we have to always look on keyboard and no matter how fast we are, we'll never be as fast with 2 fingers as people who use 10 fingers almost simultaneusly.
Typing with both hand is actually much harder to learn at first. It's becauselearning buttons placment is not the only task our brain have to do. In fact, it dont have to remember it at all. The key in this method, is to learn which fingers coresspond to which keys, and remeber what move of this finger we have to make to get particular key. At the beginning, it demands much effort from our memory, but once you get it, you dont have to remember anything. Movements become natural to you, and you dont think about them.
As another short example i want to ask you all: what is easier in using WASD? Having each finger for one direction, or using all of them with index key?
The same is with mouse buttons. Using so many of them may seem to easy at first, but the key is to make them spread arround under many fingers. Learnig curve is more harsh this way, but it procs more in long term alike learning using skills with keyboard instead of clicking them with mouse.
So the second statement of mine is that it's crucial to have buttons spread wisely on mouse. Dont have more than 3 buttons to manage by one finger. IMO optimal is to have 4-5 buttons under finger and 2 for each.
Get out of here big handers!
Third nagas/g600 (and Corsair M90 as well) sin is that so many buttons is placed side by side in quite small area. This demands more focus for proper clicking by middle handers and almost impossible to click without missclicks by big handers. Even if they manage to learn to do it properly with time, it will demand from them some big effort.
And another thing, that comes with it, is that last line of buttons is not accesible by most of users. When i was pointing it out on YT under related movies, many resentful people came and started to deny it. Offcourse I understand that those, who reacted this way, could be small handed persons. But i have many accounts on many game and it forums, and when there is some duscussion about naga or g600, 70-80% their owners admits that they dont use those last buttons, because they're hard or impossible to reach. Even famous Swifty, who play with it and make naga giveaways, admitted in his review that he dont use them.
Last dowside of this, is that you dont have place to place thumb for lifting mouse. Its huge disadvantage for low sense players.
This leads again to conclusion from second paragraph.
I think is the best to really seriosly (and honestly) think about our comfort of use before (or even after) we buy things. The worst thing we can do, is to buy under influence of advertisements, famous game personalities or crowd hype. Making a conclusions from all those informations, mouses with best ergonomics and button placement seem to be : G700 , Steelseries Cataclysm, Steelseries Legendary/Gold, G500, CM Storm Inferno, Genius Deathtaker (maybe Gila as well) Tt eSports Black Element. In some way we can put here Naga Hex and Saitek MMO 7 as well. Offcourse it doesnt mean that all of them are good. SS mouses have some issues with software, firmware and also have seen some problems with doubleclicks. Inferno, Naga and Saitek have bad philips sensor, so they wont be sufficient for fps games and those gamers who already own some mouses with decent sensor (especially Deathadder, Abyssus, Logitech G400, Cmstorm Spawn, Cmstorm Recon, Roccat Savu).
And what do you think people, and what your experiences? I invite you to discuss about all of those.