The current gym I go to has shower stalls with glass doors that you can partially see through. My previous gym had a communal shower. What I like about the shower stall is the fact it has a shelf where I can put my personal showering stuff, in the communal shower there were no shelves so I had to put my stuff onto the floor. As to leaving the door open, I close it because, the way our showering area is designed, it blocks part of the passage to the steamroom and whirlpool. What is interesting at my gym is if you want to have good look at what everyone is carrying go into the whirlpool, it is situated so as a guy enters the showers they are in full view of whomever is in the whirlpool.