I like that my membership has "no commitment" and "no start-up fees," so I don't feel tied down. I like that I can go to any gym, not just my home gym since I travel often. I like that Planet Fitness has so many locations, is affordable, and the ones I've been to in NC seem clean and have good customer service.
Gyms are notorious for making it difficult to cancel and being scammy, but I've been a member of PF before and everything was straightforward - it was easy to cancel when I needed to - no pressure to stay or wait and no hidden fees.
Recently I checked out the Black Card member section. I tried the massage chair, which was a nice treat, and I'm excited to try the red light therapy treatment.