I have been a member of the Seattle pro club since it opened, and I really enjoy the atmosphere and equipment at this gym. It's always very clean and the locker rooms are very nice with plenty of showers, a sauna and a whirlpool. Also, I have found many of the other clubs to be "meat markets" and It's definitely a place to work out, not pick up members of the opposite sex.
If I remember right, it is a little expensive to join (I think around 400 initiation fee) and about $65 a month, but well worth the extra money. I have worked with the Personal Trainers and seen great results. They also have a dietician on staff and a PT office on the top floor. One of the nice perks of this club is that they have a spa for massages and other personal hygiene things.
Another great thing about the ambiance there is that when you are on the treadmills or elliptical trainers, you get a really nice view of the Seattle Downtown and Queen Anne. It makes something hard, a little more pleasant. The staff is always very friendly as well.
The only thing that this gym doesn't have is a pool.
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