I'm on CHM. Never had to use it, but I had a catastrophic BCBS plan, so I never used it either. If I recall, the deductible, which is called the "unshared portion" or something like that, is per incident, not per year. Also Rx isn't covered, which would be a deal breaker to some. I have no problem with the faith component and lifestyle requirements, but if you are hesitant, check out Liberty. I looked at them and they seem like a reputable group.
CHM sends out info each month on who received your contribution, so it gives you satisfaction not paying into a black hole. Sometimes they give specifics. One month I helped cover medical bills for some guy who fell off his roof cleaning his gutters. Another I helped a family with a sick child. I kinda look forward to getting that each month!
THE KICKER- I'm a healthy 28yo with no claims for years. Every time I pay my monthly premium, I smile knowing I'm doing my part to take down ACA. I pay 1/6 what my BCBS plan was going to jump to this past January and my deductible (equivalent) is $1500 LESS. Help kill Obamacare. Join some kind of medical share group.