Has anyone participated in the Kaiser Permanente Medical Weight Loss Program (or similar)?

A few things hit me all at once recently, and I actually started looking into a program that I was always wary of for a variety of reasons. I didn't realize how involved it was, though.

I was wondering if there was anyone on here with personal experience or secondary experience through friends/family who could give me more info on what the program is like, cost (which is impossible to find online, which tells me it's going to be goddamn expensive), and if it was worth the money and time.