I drove a 2003 Yellow color that had about 30K on the clock which seemed to be in pristine condition. I would actually consider buying it but I have something more pressing on the agenda (house). I've also driven an NA1 but it had high triple digits on the odometer and was somewhat beat up. I definitely felt the power differential from NA1 to NA2.
Actually, I didn't find the NA2 to be underpowered at all. It climbed to 100MPH and beyond and I didn't even realize how quick it was moving. It accelerated very quickly off an exit ramp and I it was quite nimble when passing other cars. Of course I didn't get to flog it like it was mine, but I didn't find any problems.
Ideally I would have driven it with the top on to get a better feel for daily use. I've been interested in the NSX for awhile now but unfortunately it will be awhile before I can seriously consider taking the plunge. 2 myths should be disspelled (at least as far as NA2 is concerned): underpowered and headroom. AT 6'3" and change I fit in fine. So unless you're over that or have an excessively long torso you're going to fit in OK.
The looks of the car are defintely exotic, especially I think in red (my favorite) and yellow. It still looks great in other colors, just a little less exotic. I think the sportiest look is NSX-R style white with black top and wing. It depends what you're going for. I didn't test the sound system but as per this site it's subpar. The only other real defect I can think of is poor legroom in shotgun, which I'd never hopefully spend too much time in, and a lack of a legitimate cupholder (although I have seen fixes on this site).
Until I can actually get one which might not be for awhile considering I have a couple other pressing needs, I will continue to live vicariously thru NSX PRIME.