I've bought 3 machines from Pinsiders, 2 without being able to see the game in person.
1 worked out ok, although I am still finding issues I didn't remember knowing about beforehand (and I am not accusing any pinsider of hiding it, that was a very enjoyable experience all in all... I just wish I'd negotiated more
1 is on its way but I have gotten thumbs up from other Pinsiders that it's going to work out great, and the pictures look good, and the price and description look legit.
Ironically, the worst I ever got ripped off was I bought my first game from another pinsider who was real up front about the issues - I just had no idea at the time how significant the PF was to holding the price. (yes, that sounds pretty stupid to me too now) Should have offered a much, MUCH lower number. But I definitely learned from that experience!