I used the bag drop shortcut at DEN with my skis a few weeks ago. It worked well (no line), but it took a supervisor to override to get a third tag printed for my boot bag, and there's no way to indicate in the app that you have a ski bag and boot bag and that counts as a single piece of checked baggage.

It seems to be a way to lower staffing costs by outsourcing most of the bag drop employees to ABM and having one or two UA employee supervisors. Still, as long as it saves time (no kiosk), I'm in favor of it.