I find it useful for some things, in that i love the Concept 2 rowing machine and could not afford to buy one, and i find it much easier and more consistent to do structured interval training on a rower or spin-bike than actually out on the MTB itself.
I agree that the place is full of 20 something, vain, flexing fools though, but i like that as it gives me something to giggle at and breaks the boredom of what i’m doing!
I worked briefly in a leisure centre where the main mirror into the gym was actually two-way glass, so we got to laugh all day at the peacocks preening themselves in the mirror, little did they know the faces being pulled by the staff the other side