The principle problem with Planet Fitness is that you can only visit away from your home club 10 times / month - even if you sign up for the most expensive (“Black Card” $20/month + $39/year) plan - which you need to visit more than one club.
Planet Fitness’s national website says you can allows you to switch home clubs online, but “You have to have been a member at one location for at least ninety days, you must have a monthly (not annual) membership”, a pretty big limitation for true “nomads”.
Perhaps you could trick them into letting you have multiple memberships, with different home clubs, if you give different home addresses, and have multiple checking accounts (they require you to provide one), in order to the 10 visit/month limit. But if you do that, you might be in the same price range as the more expensive clubs.
BTW, some of the other gym chains I listed are cheaper (as little as $5/month), but don’t have nearly as many locations.
Some of the more expensive gyms (which I didn’t list, because they have enough money to be favorably listed by the major search engines, so I won’t bother) allow an unlimited # of non-home-club visits.
In most other respects, Planet Fitness is great. The affiliates I tried (just 3) were kept very clean, and their gym equipment was well maintained. I would have stayed with Planet Fitness, because of the price - but I wanted a club with a swimming pool and hot tub. Some of the more expensive chains have them, at some locations.
You officially aren’t allowed to bring your own equipment. I’m a bit small, and find it easier to use some of their machines with a seat or back cushion. The individual clubs I tried let me get away with that, but it’s against official policy. I would also prefer to bring my own exercise pad, for stretching, for safety, especially in post-Covid times.
Some Planet Fitness clubs have poor privacy (no curtains) in the shower stalls. They can get very busy in the evening and on weekends. Mornings and late at night not so much.
They have free classes (unless that has changed post-Covid), but they are all strength training classes. They should have stretch (e.g., Yoga) & aerobics classes too. But at that price, it is hard to beat.
They have an on-site trainer (unless that has changed too) that you can sign up for a small group session with - and if you sign up during the least busy hours, you might be the only customer. The trainer can show you the basics of using the equipment, including aerobics and stretch equipment. But the trainers often aren’t as qualified as at the more expensive clubs, and they often don’t know much other than strength training.
As with any facility, you should be careful when and where you park.