My Omron was the little 801 and was only one I could find locally when I returned from Mayo. It’s small and lightweight. The Proneb max is a heavier machine and is absolutely faster.
These are the only 2 I’ve owned and I’ve only had Proneb a brief time. I wouldn’t have known if Omron wasn’t putting out as it should’ve since it was first one. It just made sense to me that it was difference in psi. That’s why I said maybe others with more compressor experience would share.