I went to the TPF this past weekend. Pretty good show overall, I would say, although I've never been to any others, so I can't really compare it. The only disappointing thing is that quite a few machines spent a lot of time being down or had flipper issues (at least the machines I was interested in), but with the volume of people playing, I suppose this is to be expected (well, at least the down time is, I imagine).
Their arcade game selection seems to grow just a little bit every year, but again, down time and control quality are always an issue. Tried to enjoy playing an upright Stargate, but the stick was very flaky, just like the cocktail Defender they had last year and then the Tempest they had was down and out quite a bit, until it was sold and moved out early. Oh well...