I like mine a lot. I've got the big manual MOD CQD and a Mark II, and an auto Mark I. Very strong knives, excellent blades that hold their edge. The big ones are VERY big, of course, which is where the Mark II has an advantage. For all its lesser mass, the blade is almost as long as the Mark I.
I find all of them very dependable, and although I rotate among carrying newer knives, I keep the manual CQD and Mark II handy by the front door as a good knife to carry, especially at night or going for a walk in the woods.