Can't speak to the parent posters' experience, but for me, it covers a lot of imaging, routine bloodwork, cheap Rx for a lot of basic medicines (think blood pressure medications, diabetes meds.) I can get a full basic blood panel (CBC, CMP, LDH, ALT, TPT..etc) done for a few bucks instead of paying several hundred, that alone has saved me a good chunk of change over the years.

One of the huge benefits for me has been that I have much simpler access to specialists. They are somehow able to punch through a lot of the scheduling bullshit for me, so when I do need to see a specialist, I am not waiting for weeks or months; Sometimes I've been able to get appointments at a specialist through them within a few days instead of the few weeks it would have been had I tried doing the same myself.