I got a mechanical Razor keyboard, and I have some issues not using it at other places, like work and such. The speed is the KEY difference, you *hear* and *feel* when the key is pressed compared to a "rubber" regular keyboard. So the responsiveness in the keys are completely different and it makes quite the difference.
With that said, I had no problem with my old non-mechanical one, and I only got this because I got it in a combo-pack with a razor naga mouse wich was the reason I bought it. But now after using this for a year or so, I wouldnt go back BECAUSE I'm used to this "feel".
The clicky sound is quite loud, so if you are easily annoyed by stuff like that, you should stay away. And really, a keyboard is a keyboard. If you arent missing keypresses on what you are using now this wont make you better or whatever you want to call it
Its nice to type with though due to the fact that the keys are quite bouncy, and the sound/feel lets you release keys faster and with more bounce and atleast I am imagining that my typing speed has risen since I got it.
Now if I could only get a keyboard that fixes my spelling/grammar