I used to have a 99 air, and I loved it. pretty sure the tsc hull on the sport/airs were the same as the ss/sans for those years. The wake was nice with a 600 bag on top on the stock 400 in the back 350s next to the engine and 350 up front. The only bad on that boat would be the older perfect pass and gen 1 flight control tower, we switched out both on our old one. The only boat I would have ever traded my air for was a super air and eventually we did.
23k is a pretty good price, see if you can deal him down a little though