They are nice! I've got the same (MG725) as Rick, as well as, the 3/8 drive model (MG325 - 425 ft. lbs).
Those figures are break away torque though...
They both run on my little compressor fine.
810 lbs is the held IIRC. Still crazy high
Lads got a 3/4 inch 1 for the bigger stuff but we've never had to use it yet. Weighs a tonne, this one is nice and light. I'm looking at getting the 3/8s model. Just bidding on the wobble sockets on ebay that are 3/8th's.