I have concierge medicine. I have two specialist appointments scheduled both take about 3mo.
I can see my PCP within 1 day. That is good. I can have blood drawn within 1 day. That's good.
Specialists, no advantage. This makes it not overly valuable, but what do you expect for 8k extra for year (on top of very good health care)?
I don't know how to access a higher tier of health. Perhaps at 100M+ of net worth it appears. IDK.