Handy for my "grease the groove" style training to track the smaller sets through out the day. The custom exercises are useful for the weighted calisthenics movements that aren't there by default. Monthly Pro doesn't quite seem like it's worth it to me for the cost they're asking but I would pay like $20 for unlimited routines and exercises. The free tier does give me enough as I only need 3 routines and a handful of custom exercises.