Yes I have. In fact, just yesterday.
From 3,700 to 4,500 takes ≈8 minutes! The ambient temperature makes a bit of different. They tell you is takes 3.75 to 4 hours to fill a 12 cf tank from 0 to 4,500 pounds. It doesn't! Fact is, it only take 3 hours!
It is quiet too compared to the Shoebox. The requisite shop compressor sounds rather loud as well. About all you hear from the Omega is the cooling fan running, and the swish, swish of the main compressing cylinder.
It is going to get a workout tomorrow, as I'm driving down to Carlsbad, to join Lon. I have two guns to site in, and he wants to plink a few bunnies. Aught to be fun!