The seats are a bit worn, but other than that the car has been fine.
It wasn't cared for by its previous owner, and so far I have:
Replaced brakes (all 4 wheels).
Replaced the headliner.
Done a bunch of body work to remove dings and minor rust.
Put a new stereo in.
Fixed the power antenna.
Converted the air conditioner to R134a refrigerant and repaired the power windows and sunroof (wiring problem, they're related).
This car has some serious power, and some serious handling.
The car is unusual looking, and many people laugh at it, my girlfriend even referred to it as my "inverted bathtub on fancy wheels".
I would not hesitate to buy a new Saab product, in fact, my stepfather has a brand new 9-3 (successor to the 900) and it's a wonderful car too.
Dealer service and support is incredible.
I presently own a 1985 turbo, 1999 9-3 and just purchased a 1985 900 (non turbo)
The 1985's have 192k and 133k miles and are both great driving cars. The 9-3 however, I find just doesn't handle as well as the "old" Saab's. Was kind of disappointed with the 9-3. Even though the 900's are getting worn out I still like the way they feel. Go figure.
Both 900's have experience the falling headliner, and one is in need of steering rack replacement, otherwise, still going strong! After 192k we are still on the original turbo to!