Let me add my 2 cents:
Ive been with Planet Fitness for about 4 yrs, I originally joined due to the price and the particular one I go to is never really crowded except for the hours of like 4pm-8pm, and I usually go in the morning. Is it a perfect gym, far from it, I dont like the color scheme but that isnt a huge issue, I wish they had more free weights and less of the cardio machines which honestly they have way to many. There are some gym rats (ie the buff muscular guys) that go to the gym but honestly for the most part I see more older people (ie 40-55) and women than I do men my age (late 20s) but then again i go between the hrs of 8am-11am). I just got back myself. There is 1 personal trainer who looks like he is 18 and I never see him with anyone, so take that whichever way you want to. I may be looking at another gym because I want to start using the rower and it appears my gym doesnt have 1. Also yea the tanning machine is stupid, I never see anyone use them most real tanners are going to go elsewhere