I bought a 56" bottom box when I was working on an island in the Gulf of Mexico. I figured that, with all the salt air, I didn't want to invest in an expensive box that would just rust away, so I went with the Harbor Freight box. 15 years later, I'm still working out of the same box. I never expected it to last this long but it's held up like a champ. Other guys in the shop have nicer boxes with fancy hutches and lights and power strips and stereos, etc, but I don't actually NEED all that stuff. My box has wheels and locks and that's really all I need. I have been outgrowing my box and I finally expanded with a top box, side locker, and a side cabinet. I also have a free-standing locker for misc stuff that either doesn't fit or is just too messy to put in my toolbox (grease tubes, oil pans, fall restraint, etc) It's easy to get dissatisfied with my cheap box when I start comparing to some of the nicer boxes in the shop but, as Teddy Roosevelt said, "Comparison is the thief of joy." There will always be bigger, better, fancier boxes, but those come with a price tag that I'm not willing to do. Some of these guys have 5-10 year payment plans on a box that does the same thing as my paid-off box: hold tools. I'd rather put that money INSIDE my box in the form of tools (or into a retirement account so I don't have to keep doing this until I'm in my 70's). Overall, I'm surprisingly impressed with the HF box. As an added bonus, it doesn't hurt nearly as bad when mine gets scratched or dented. If I had $30k ******* in the box, I'd be pissed when somebody bumps it with a forklift or a pallet jack.
A lot of the new guys come in and see these big, fancy boxes full of Snap-on tools and think that's what they have to do to be a "real" mechanic. These poor guys end up with a $70,000 running tab with the tool truck before their career even starts. I try to tell them to start out with some basic, quality off-brand tools and upgrade over time as they discover what works and what doesn't.