I only own European and American made boxes. That said, I have been to a HF and examined closely the rolling tool cart (I think it is 6 or 8 drawers). I am willing to wager that the gauge thickness of steel used in construction is thicker than the equivalent Snap-On rolling cart. This really surprised me. I realize the HF boxes are made in China, there may be some issues with attention to detail in construction, but at 1/5th the price, I do not see the Snap-On rolling cart being 5 times better or worth 5 times the cost of the HF version.
We get it. WE ALL GET IT. The HF boxes are cheaper than snap on. Can’t we EVER compare these tool storage solutions without ONLY resolving the discussion with these exact same words?
Regarding the first half of your post, not sure about you, I don’t bring micrometers to tool stores. Not sure how you could possibly know the difference in sheet metal.
I can tell you I was recently considering a HF 5 drawer box for my heavy equipment tools (not that they are heavier than....):
My little Snap On KRSC33A is only 33" wide, 3 drawers, and is 30lbs heavier than the HF 37" wide 5 drawer. Snap on lists their roll cart's capacity at 1200lbs, and HF at 700lbs, but what does that even mean? And no way I have 200lbs of tools in my roll cart. So who cares about the shipping weight or caster capacity?
Now, if you think heavy duty casters, drawer slides and thick sheet metal are indicators of a tool box that will operate easily for many years, then maybe such things are worth looking at. But for many of us non-pros, I'd question whether we will ever use our boxes enough for them to be impacted by wear.
I guess if you asked me (and I note that no one has), I like my little KRSC33A. The drawers are all 3-5/8" deep and I find them very usable. I like the smaller size of it and I like the drawer slides and latches. That's it. Its roughly the size and config and how the drawers feel. Everything else to me is just noise.