I'm 5 weeks into a 6AM boot camp which has 1 week to go, but I got so much out of it that I've signed up for another 2. I'm 6 ft tall, and I weighed 86kg. At my peak in recent years I haven't been able to get below about 83, but right now I'm sitting at 79kg.
I'd definitely recommend it for anyone that can't really find the motivation to exercise. Your exercise is out of the way before you even start your day, and you feel awesome. It wasn't much more expensive for me than joining a gym for the same period of time.