I have owned this car for a year now and put on 15,000 miles. It is easily just as much fun now as when I first bought it, actually more. I started auto crossing it this year with amazing results. The corner steering is pretty pushy but that is about the only negative thing I can think of for the STi and that can be fixed with bigger sway bars and an alignment. The ride is pretty comfortable for a long trip and as long as you are easy with it, it gets good gas mileage for 300HP. Overall I believe it is a wonderful car for the money.
My favorite features are probably the HP/acceleration first then the handling around the track. The interior colors are wonderful for a black or blue car but not so much for any other color.
More choices in interior color, a more aggressive suspension (people that buy these aren't in them mainly for comfort).