Dirte, my first ever 4500 compressor was a Shoebox that I got from Joe Brancato. Used it sparingly for 4 years (I didn't need to air up my tank frequently). It sprung an irreparable leak and I replaced it with the Omega Air Charger (actually it was hit by a dang .22 LR ricochet right on the left-side surface of the metal box between the lower cylinder and the place where the output line ties to into the male foster fitting. Tried some JB Weld, but the pressure was too great for the JB to hold).
I like it that the Omega Air Charger is a "stand alone" compressor that doesn't need a pusher compressor like the Shoebox does. While my little Shoebox served me well, this Air Charger is really nice. It airs up my tank from 3000 to 4500 in no time at all.
Right now my air tank is down to about 3300 psi and when it gets to 3000, I'm gonna hook it up to the Omega for the second time . And this time I'm gonna time it and see how long it takes to reach 4500.
I thought the little Shoebox compressor was heavy, but this Omega weighs a ton. When me in a wheelchair, the Omega ain't portable.
Bobby