This may have been covered in an earlier post and I missed it. If so, I apologize.
My biggest reservation to AquaLung's Auto-Closure Device (ACD) is you can't see the inlet filter. Inspecting that filter is important because you never know what particulate matter may have been in the tank. Compressor filters fail, tanks corrode internally, and fill station manifolds and cylinders are rarely assembled in a clean room. Granted, the probability is low that an unnoticed catastrophic clog will occur. However, a slow performance degradation may be worse especially if you are on vacation and make a lot of shallow dives before making one much deeper.
I have seen one instance where a first stage filter was fully plugged during the first dive due to some very sloppy maintenance. How well do you trust the whole air source system and the people operating it?