I just bought my 1998 Altima a week ago and I love the car, it is in excellent condition. It is very comfortable, spacious, tight, handles well, and runs very strong. To keep within the speed limit I have to use Cruise Control and that is with the 4 cylinder! My only complaint is that there is a moderate amount of road noise,especially from the agressive 60 series tires. That aside, I'd buy a new one after I own this one a little while and I've heard from many people that if you change oil regularly and keep up with an Altima, you should be able to get 225,000 to 250,000 miles out of them easily. The many car Ads I saw proved this out. Enough said.
Interior room. It is the first car with a sunroof that I've been in where I don't hit my head on the roof itself. Also,interior comfort and a 4 cylinder with power.
Road noise is a bit of an annoyance that takes getting used to.