-
The switches on a typical keyboard(dome membrane) when you push the button it presses down a rubber bit and that then presses metal to metal when it bottoms out which is kinda a thud for your fingertip. On most mechanical key switches they have a tactile bump and the switch registers as on half way along so you aren't constantly thudding your fingertip down as hard. Longterm that will also help reduce RSI.
Can easy pick up a tenkeyless for £30 or full size for £40 if you don't mind cheaper switch types.
What's the fuss about mechanical keyboards?
(I don't really know what one is or why it's better than another)