Im an owner of 2007 STI.
There are many trims and models of their sedans... how many cars have a name this long? "Subaru Impreza WRX STI Limited". you start off with your TR model, next up is your WRX, and then an STI, and there are the rare (800) STI Limited.
It is said that the 2007 STI is the last year of the best looking STIs ever, thanks to the hideous new 2008 STIs (hatchbacks) that replaced them. However, the imprezas themselves in the 08s are actually ok looking.
The interior is so-so, very minimal. whats worse is the sound, there is almost no sound dampening. the ride is harsh. the handling is sharp. but these are all turn ons for enthusiasts, hearing the boxer rumble, the feeling of knowing what your tires are feeling, the cars response is limited by your own. the boxer rumble is unique, you can hear an WRX/STI a block away with confidence that it is in fact a boxer engine.
FYI the STI is nothing more than a beefed up WRX. better transmission (more solid), 6speed vs 5speed (?), more horsepower (~50 more), the best brakes you can buy (14" Brembos), Subarus STI rear spoiler. what enthusiast WRX owners do is end up spending so much money modding their car to be an STI after the handling, braking, transmission (and more) upgrades and realize they could have bought an STI for a lesser price
The STI is the u.s.a. flagship version of subarus sportscars... ie, totally different in japan, which includes a 400hp+ model.
looks... these cars are not "pretty", nor do they look like sportscars. they are... boxes on steroids. However, there are a limited number of quality body kits that can enhance the looks, I would say several actually make the car better than stock. STI will rip a good amount of cars off the line, however they are limited by their small turbos. ie any evo will take out an STI (equivalent year) due to the larger turbo size... however, when both are on the same turbo, its another story as the STI boasts 2.5litre vs mitsubishis 2liter.
imo, if i could do it again, i would have bought the recently released 2008 Evolution X as mit$ubishi took a nice step forward in their design, what $ubaru did... i cant figure it out with the new hatchbacks. killing its 4door box heritage and replacing it with what looks like a ma7da3.