Just picked one up with 85K miles on it. I wanted one back when they came out, but I ended up working overseas. So finally bought one! Simply put, it's incredible! I've owned a variety of cars in my life, but this is the first one that I actually take out for night time drives after the kids are in bed. It's got some pep in stock form. Great handling. A little low on the torque at high RPMs, but I prefer low-end torque on windy roads anyway. There's enough space in the back for two child seats, the stock speakers are quite good, and the front seats are really comfortable. The fuel mileage couldn't be better either - I'm anticipating 500 miles per fill-up.
Low-end torque, handling, unique and classic styling, unfrilly dash, sunroof, fold down back seats, fuel mileage.
None. In fact, I'm having a hard time deciding what kind of performance improvement mods to do as nothing is really needed.