Used my new A10 for the first time last night, and being able to check and adjust levels via the phone app was even more of a game changer than I expected. Recording came out great, transferring it now.
I was running AT853 cards (modded) into a Church UBB, and started Audio In gain at 12, later raised to 17 during a set break as I could see I had additional headroom. This was for a loud-but-not-super-loud show (just barely not requiring earplugs, though I had them at the ready).