AD vs Secondhand?

Been wanting to get the Tudor BB54 since its launch but so far not only has none of the ADs gotten back to me, the retail price has even increased!

A friend of mine recently introduced me to the secondhand market, where I can get a brand new or “like” new BB54 for at least $500 below retail. (Probably people just buying Tudors with ADs in hopes of getting a Rolex)

This is my first watch purchase so I originally wanted the “full experience” of buying a watch at an AD with my name on the papers and the supposed service. But emotions aside, going secondhand allows me to get the watch now and at a lower price. Is there something I’m missing or should I just get the watch now? What benefits besides assurance of authenticity would I get from waiting for an AD’s call?