I just joined Planet Fitness after years at a popular competitor gym. The gym space is basically a big open area with some open rooms on the outskirts dedicated to abs workout machines or stretching. There are tons of cardio and workout machines to choose from. The place is clean and the staff is friendly and helpful. And it's not very full though there are a good number of people. It's open 24hrs so you can choose less busy times if you like.
The only big downside is there is no benchpress or unassisted deadlift bar, which could be a deal breaker for some people. But I'm willing to sacrifice this for $10 a month at PF versus $50 a month at my old gym. There is also a dumbbell free weight area that's good enough substitute IMO.
You definitely get more value for your dollar at PF.
Breakdown of signup and annual fees before taxes:
Planet Fitness costs:
$30 enrolment fee, or free if you sign up during special promotion days
$10 a month, or $120 a year
$40 annual fee
Total costs = $190
Competitor costs:
$170 enrolment fee
$25 bi-weekly fee, or $50 a month, or $600 a year
Total costs = $770