Ive got a .177 FWB 124, it was a sleeper from a collection I picked up. The piston seal crumbled on the first shot. I then had it serviced and a new seal fitted. I've fired a few shots and its lovely. Its now though oiled and boxed away, kept nice and tidy for the next bloke....Or, until I have a sudden need to use it. As for value I wouldn't sell it for £500 scoped up with a new Kasnar, as I couldn't get a better one. But i'm sure that there are good ones out there for less money.