Use it all the time!
I book all my doctors appointments through Zocdoc. Ive only had two doctors cancel, and I was notified very quickly so I was able to reschedule. I love being able to see the locations of doctors on the map and filter doctors who accept my insurance. Most doctors even let you fill out forms ahead of time on the app! Love it!
Beelow137 about
Zocdoc, v3.4