Although this is my third car in which I installed a short shifter, I'm still surprised by what a huge difference these make. I went with the Kartboy shifter and spent a day driving with it before installing the front and rear bushings. The shifter alone was a drastic improvement over stock in terms of throw and feel, but it was a little hard to get into gear at times. After installing the bushings (and losing a lot of skin off my hands; should have worn some mechanics gloves), the shifts were precise and easy to get into gear. The only issue is sometimes I have to let the parking brake off before trying to get it into reverse.
Overall, best mod I've ever done when considering the improvement over stock. Although the install instructions that I collected from various sources on the web were straight forward, in retrospect I would have been happy to pay my Subaru specialist to do this install (especially the bushings). It just required a lot more time and a lot more skin off my hands than I expected.