Amazingly well handling car. I have made some minor improvements to the suspension (swift springs and swaybar/endlinks), very well mannered in the city as well as in the mountains.
The car is quick enough for me to remain happy with its performance, and not feel the need to do the whole engine management side of things.
Interior is efficient in its presentation and appearance, visibility is excellent from the cabin of the car.
I have made several long distance trips in this vehicle (Seattle to Montana, and Seattle to its new home in the SF Bay Area, as well as trips to Tahoe and Washington Mountains) and was plenty comfortable for the trip, even with driving 13 hours straight from Seattle to SF.
The seats are different in the Sports model than in the Premium and Standard models, so keep that in mind.
I have had no significant problems with the car to date.
I receive compliments on the car all the time; it is definitely a unique automobile, and people do notice. Just something to note, in the 50,000 miles that I owned my Impreza, I never needed any work done, other than the regularly scheduled stuff.