Yeah, Air-quenched, like 154CM, and VERY dimensionally stable in quench. We do it two ways. Either pull,cut,squish,grab,wave,plate(optional) OR just throw the whole packet on the aluminum plates. Mr. M has a huge section of 2" thick round aluminum and we throw a plate on top of that. Works pretty well. Depending on the profile you might wanna pull it out of the packet, but that can be tricky. I don't like fighting with the packet when it's hot and needs to cool *NOW*. I'm doing less O1 because it's pretty much the most complicated sequence when you add oil AND the packet. But I *LOVE* not having to go back to 180g to sand out the decarb, and it helps protect against overheating from the heating elements.
A2 has a narrower toughness curve than O1 for tempering, tho, and the target temps are just on the edge of regular domestic equipment capabilities so you either have to pay close attention or temper in the kiln.
The foil is about .002" thick and goddamn sharp when it's cut, so gotta be careful.