I've watched the odd episode of Mythbusters and really enjoyed it. Unfortunately, I don't have Sky at home and so haven't really had a chance to watch much more of it, but I'd probably do so if I had the opportunity to. In respect of whether their methods are that scientific or not, I hadn't really paid much attention to that really, but I suppose it's a valid point. I agree with Mirage though, in that regardless it does show whether something is possible or not, regardless of how realistic it is.