This is my 3rd zx2 (all leased as new, in 1997, 2000 & 2003. When I found out this is the last year, I bought it. So sad that this will be my last, I love this car! As already noted several times, the rough idle is a drawback. The steering wheel sometimes vibrates so hard at a stoplight that my hands get tingly. But since that is my only complaint, I can live with it. The most comfortable seat I've ever seen (felt) in a small car, it fits like a glove, with great lumbar support. I do think of it as a sports car, I've never subjected anyone to having to ride in the back seat, it just seemes too cramped, although it would probably be fine if you have kids.
Good milage, low maintenance, it can really step out and looks good doing it.
The rough idling, of course, and more importantly the fact they aren't being made anymore. The dealer told me the Focus is a good substitute. Oh, please spare me that garbage!