I have the 1987 760 wagon - same as the 1990. For being 20 years old, this car drives great. Gear change is a little rough, gas mileage could be better, and some small electronics need to be replaced, but in all honesty none of that matters. It's possibly one of the safest cars ever built - even without airbags, the paint is literally impossible to rust off, it has almost 200,000 miles, yet still goes 0-60 in 8 seconds thanks to the turbo - which is awesome. The seats are super comfortable, and has all the conveniences of a modern car - power everything, heated everything, awesome stereo for being only 4 speakers - i could go on. if you get a chance to buy a 700 series volvo - do it.
heated/power mirrors, power windows and moonroof, huge cargo space, super sturdy, easy to work on, the paint is amazing, stereo has an equalizer, turbo engine, easy to park for its size, brakes are excellent, turns on a dime, very reliable.
gas mileage is bad, gear changes are rough, the ride is rather bumpy & noisy, steering is odd (sometimes it's loose, sometimes it's responsive) parts can be expensive if forced to buy new, noisy when idling/ going under 10 MPH.