I have 52k miles on mine with no issues. Simple, Reliable, I see 33-35mpg regularly (90 miles a day commuting). My biggest complaint is that the seats are on the firm side and not very comfortable on longer drives. Yaris and Fit seats are much more comfy. Mine is the SE package, came the 16 alloys stock as pictured above, a bigger front sway bar (I believe its 3mm larger than stock), firmer shocks and springs (reviews always mentioned the stats "25% stiffer in the front, 12% stiffer in the rear"), foglights, power windows, 6 speaker stereo, B&M short throw shifter...optional sunroof and cruise control.
I have made a few small mods to mine...
I did maybe 6 or 7 autocrosses when it was stock and the biggest problem was getting the car to rotate. I was probably doing it wrong. All I had was stickier tires and -2.0* camber set up front.
For a while a lot of online dealership vendors were having blowout prices on accessories to clear inventory. A nice DC Sports strut brace for $14, AEM short ram intake for like $30. B&M short throw shifter for cheap. some of the items sold out, some are still available.
I dont think its going to be the next hot autocross champion, but I think a used SE is probably a good bargain priced, fun subcompact if you are in the market for one.
I think a lightweight flywheel and exhaust would really wake the car up.