Most people on this board will tell you to stay the hell away from the show, that's it's boring and pretentious. Personally, I thought it was pretty good. I think it depends largely on whether you like Harold Pinter's style.
When I went in previews, Clive came out relatively quickly, and signing down the line pretty fast and left. However, a couple weeks ago some friends of mine went and managed to get a pic with him, but I don't know if he does that every night.