I think Tony is scaring you a bit about the hygiene, it's about the same as California, but hey, no need to take my word for it, just take a tour.
My only gripe about Physical is that the showers are cheap quality and because it's potentially so cheap, you get the amateurs in and it gets busy. If you don't bring your own towel it's an extra $10 each time.
I usually switch between Physical and California every 2 years as the promotion period comes to an end and hygiene wise, you are recommended to wear flip flops in the changing rooms and showers because even though the floors appear clean, because of the mass market crowd, you are bound to pick up an athlete's foot or two. And it's always a good idea to shower at home even after a shower at the gym as an added measure.