I fully support Keyclone (I have 5 copies, though I only use 4 heh).

I haven't used AHK, but I get the impression that there is a LOT of time spent by the user setting up keybinds by writing their own script. Keyclone is pretty self explanatory in my opinion. It's ready to go right out of the box.

Just ask yourself whether $10 is worth it to not have to program your own script for a few hours. Sure is to me.