I did two interviews in Minneapolis and went to Lifetime as a guest while I was there and LOVED it. When I went to Columbus, OH for an interview, I sought out Lifetime and went as a guest there.
I wouldn't use CLUBBY to describe it. It's upscale and then some, and I really, really liked that. (If only I could afford the dues if I lived there!) But clubby, no, not like a country club or somewhere like that, at least not what I saw in six or seven trips to two of their locations.
Best suggestion is to try it. If you can afford it, it's the Lexus of gyms.