I started F45 a week and a half ago with the free trial and signed my membership yesterday. The trainers are super motivating and they really push you to be your very best. With the heart rate monitors I can see how many calories I burn and it's usually anywhere between 700-900 calories which is insane for a 45 minute workout! Far more than what I would get running on a treadmill for the same amount of time. At the rate that I'm going, I think I'll get some definition within a couple weeks.
The facility is very clean and they even have showers so i can shower after my workout before I go to work which is so good considering I work across the street at the Howard Hughes office buildings. Parking can be annoying bc there are so many restaurants around it, but if you go in the morning it's not an issue otherwise you may just have to park at the far end of the lot which is not a big deal.