I picked two 500's up last week when they were on offer and I have been impressed by them so far. I flashed one of them with atv, vix and pli and had a play, decided vix was most suitable. Installed the drivers i needed and put a different skin on each box. One is being used for now as a freeview box with a PS3 tuner, the other is being setup in the bedroom with cable.
If you can find and follow bees setup guide you should have no problems at all