My 88 has been good so far. Put plenty of different rounds through it including some 3" 00buck without a hiccup. Time will tell though as it's not that old yet. I got mine for $180 including transfer fee so they are a bit cheaper.
I have a couple 88s that I have been putting rounds through, no problems. The only bad thing I can say about the 88 is the pump. If you can find a 500 pump, replace it. There are no upgrades for the 88 pump, but if you start with a 500 pump you can get a pistol grip mod for it that will fit the 88, but you must have a 500 pump to start with. Of course, my issue is purpose based, an easy solution is to attach a strap to the pump. The 2 biggest differences are the pump and the safety. I believe the 500 has a firing pin safety, and the 88 has a trigger safety.
I have stripped all mine down several times, they are really easy to work with, same as a 500 in that respect. I've seen pricing on the 88s go from $120 up to $300. I would not pay more than $200 for one brand new stock. 500s can be found $300 and up.
That is good to know. I got mine for $180. There was a 500 with both stocks for about $260. After my purchase some guys made me think I had dune bad. I have shot it several times and I really like it! I am going to the gun show to get a pistol grip this weekend.
Depends-- I bought a used one that look new for right over $100 off of GB-- I am happy as heck with it for what I bought it for. That being said, if I had the money, I would buy a 500-- but that being said, if I had the money, I would buy a Citori in 28 Gauge...