My first experience will also be my last. I recently moved back to the Boston area from New York, and needed a new PCP. This was particularly urgent as I am a heart patient, and require regular refills of several prescriptions, mandating a referral to a cardiologist While I wasn't thrilled with the choices available, I gulped and made an appointment, which was confirmed on Jul 22.
Today, I received a call from the doctor's office; my appointment was cancelled, it was "made wrong." How so? "The doctor doesn't have enough time to see you." When I remonstrated, I was referred to another doctor, who has availability in mid-August. My prescriptions will have run out by then, but we'll see what can be done.
In any case, my sense is that ZocDoc doesn't necessarily attract the best and brightest in the medical profession; certainly, this physician's staff rate something south of "F". As noted at the outset, I consider my use of ZocDoc to be a failed experiment, and I certainly wouldn't suggest that anyone else try it.