Cabinet looks great, backbox is banged up a little but not horrible, it still has the red dome on the top with the colored plexi and the playfield looks to be mylared. It's hard to tell but looks like none of the playfield inserts are lifting under the mylar.
Is the face shield plastic or the spiral ramp (at the very top) busted? How are the boards in the backbox, are they all hacked up, burnt up connectors? It looks like at least the 2nd player display (Alpha numeric) is outgassed. I don't believe you can replace them with new anymore. Finding a replacement or converting to the led versions might be pricey.
Still, $900 is a good to decent deal on it. It's a good playing game but can get old. I owned one for years. Lots of pinball noobs played it and enjoyed the hell out of it. It's got staying power though, lived for YEARS in the arcade I grew up in on a college campus so you know it made money.