i dont have an sti short throw but i've had my kartboy one for quite some time and its a huge improvement over the factory shifter.
many will recommend the cobb adjustable ones as well.
maybe try finding someone local so you can see for yourself what kind you like.
ps: make sure you're posting in the correct forum
Transmission & AWD - ClubWRX Forum - Subaru Impreza WRX and STi Community and Forums
the one you posted in was for new members to introduce themselves.