I have a couple decent toolboxes. One is a chinese stainless steel box, built pretty well, think I paid $650 for the roll-around + upper-box. Been pleasantly surprised with its quality, given it was chinese and so cheap. Hammerhead brand iirc. I also have a decent craftsman I paid $900 for that still feels new after 4-5 years of use (not every day though). But seems a lot of the 'professionals' these days think if you dont have a $7k snap-on box, you just have crap. *shrug*
I inherited a few Kennedy's from my old man when he died. He was an old-school machinist and they were top of the line boxes 20-30 years ago. Not sure if they still make good boxes, but those old ones are built like a tank.