My biggest complaint is that they are just built too small for me-.
Machinist boxes are sized differently in all respects compared to a mechanics box. They're not designed to be interchangeable. I have two Kennedy stacks, one machinist & one mechanics (pictured below). Admittedly a little tall at 6'10" with lid closed & a step stool is required to get in the top but 25 drawers in one location makes for a lot of storage. Heavy gage metal, adequate slides (wasn't willing to pay extra for ball bearing) & stout drawer pulls. Is there something better? No doubt about it but you are going to pay accordingly. I mean no offence by this but I never factor in offshore stuff in the equation. I just don't consider it as an option personally.