It is effectively a PPO (similar to the Kaiser plan someone else mentioned), so we have access to exactly the same physicians that we had already where we were paying for private insurance. Our annual premiums went from about $85k a year (on the private insurance) to around $10k out of pocket.
We are fairly healthy, though my wife is going to have some major joint surgery. What was interesting is that it was our PRIVATE insurance that stalled and stalled over approving the surgery. When she switched to the MA plan, it was approved immediately. (That stalling finally motivated my wife to make the switch out of the private insurance.)
The downside of our MA plan is that we are not going to be able to move out of the area easily. But you always have that issue regardless -- finding a whole new set of doctors and dentists when you move...
I do get these phone calls asking to schedule a "wellness" check that the article writer mentions. Oddly enough, my wife didn't get any (so far.)