I have just purchased the Montezuma Elite 72" roll cab and I am very pleased with it so far.
I've been wrenching for 25 years, 23 out of a Snap-On KR655 with mismatched top chest. I work with a guy who has the Snap-On Classic 96 and there isn't much of a comparison: the Montezuma is better, IMHO.
It is way bigger, and the metal is thicker and the box feels sturdier. There are 2 sets of slides each for the deep drawers. There are 6 spring loaded casters for support. Finish wise, it is equal in every way except the handles. The Montezuma handles are not a bent and squished piece of chrome tubing, they are very solid and HEAVY. Rolls as easily as you could expect 2500lbs of box and tools to roll on our dirty and rough floor. On the smooth spots, it's really great!!
My top drawer is loaded with sockets, ratchets and extension.
Loaded. Zero flex or issues so far. Very smooth and solid. Opens and closes more easily due to the load, compared to empty drawers. The detents on this unit are very positive. It even comes with optional bumpers to make then a little easier to open and close, as they are quite stiff.
I can't speak for durability, but I see no reason it shouldn't last at least as long as my 655. In all honesty, I think it is built better than it, too. One on-going issue I had with the 655 was the drawer slides giving out regularly. The Montezuma slides are appreciably heavier than the Snap-On slides in mine and my co-workers. This is necessary due to the depth of the drawers, and it shows.
As for the higher lines of Snap-On boxes, I don't know how it would compare. I do know there is no way I'd pay that much for a box. A comparable top line box was listed in our latest Canadian flier where the payments worked out to $15,000 at the end of term. I'm sure it's a great box, but come on!