I have an 835 that ive had for years. It has prob around 3000 rounds through it and never gave me a problem. Has alot of recoil but other then that its a good gun. The difference in a 500 and an 835 is that a 500 has a 3in chamber and the 835 has a 3.5in chamber. I dont know anything about the 935 but im sure its as good as the pumps they make. Both of those prices sound about normal for a Mossberg. I would get one if i had the money.