I just recently bought a Naga over the weekend.
Colors are great and it is very responsive. Obv I cannot speak on the durability issues but I can comment on the learning curve/muscle memory of using this mouse. The only problem I have had thus far is just trying to memorize all of the spells/abilities bound to each button. I got done with my first bg using it and said to myself how the hell am I going to play with this thing. It obviously gets gradually easier to use, but coming from a mouse with 5 thumb buttons to 12 it quite the upgrade.
Best advice I can give through all 9 of these pages...give it a try. In the grand scheme of things it is $80, it is not break the bank worthy so I doubt it will make you poor purchasing one. If it breaks, take it back, I believe it has a 1-2 year warranty.