A friend just reminded me of how difficult it can be to judge games on site. He sent me a mail with this comment at the weekend:
"Played an Elvis on site when I was away last week and it was shocking. You wouldn’t believe it was the same machine that I played at yours."
I know what he means, add a bit of dirt, a few switch faults, volume set at a level you can't here and it can kill a good game. It just brings home the importance of good maintenance on site.