Tom Bowlus does one of his excellent in depth reviews of this head.
Mine is more of an impression. At 50-55lbs., present day me had to work to set in on the OBC810 cab. I love the oversized volume and gain knobs. Though not numbered, the dial adjustments are 1 to 11. My amp goes past 10 to 11. The power and standby toggles, not being marked on/off , took some internet investigating to determine which way was on/off. Up is power off. Up is standby on. I like that the amp is quiet. No buzzing or fan noise.
The owners manual in the box is 90 pages long. Only the first 5 pages are English. The online version, though lacking, is better than that.
Matched with the Orange OBC810, it is the most colorful, coolest, rare bass rig in my room.