I have a complete garage full of it, very nice products, but don't get sweat on them, it reacts with the finish on the cabinets and you can't get it off. We have called them about it and they might have a fix for the newly made products (I have had mine a while).
I looked at Gladiator but wasn't wild about it so went with Craftsman Professional and am very happy. Here is a link to some pics that I posted recently of my garage which was almost done but still had some finishing touches that it needed. Sears runs it on sale @ 20% off regularly and is pretty reasonable when on sale.
If you really need some quality stuff find a Lista dealer. I just replaced old Craftsman, Snap On, Matco boxes, and cabinets with Lista and the quality difference is amazing. You won't be disappointed and the price is less than Snap On. One drawer in a Lista box will support 440 pounds. Much better quality. Give them a call and check it out.
I'm using the Gladiator Cadet stuff from Northern Tool. I have 6 wall cabinets in my garage. Very happy with them and I am a picky person. They are advertised as 50 pound capacity. If that was true they'd be on the floor right now in a crumpled mess. They hold WAY more than 50 pounds. I think it's more a factor of how you mount them to your wall than the rating of the metal they are made of.
I have the Gladiator 8' workbench and Gearbox in their "Premier" series and they are very heavy duty and strong.
The "ready to assemble" series is thinner and cheaper quality.
The Premier workbench is massive with a 1-3/4" top and weighs a ton:
I agree that there is a quality difference between the various levels of Gladiator stuff. But if like me the OP is looking to store jugs of this and that I have been quite happy with the Cadet series. If doing shop work I would step it up a notch and get their better series.
I do not use my garage for a shop normally. I have a shop and that is where the workbench is that gets beat on. The workbench in the garage is more like a table for beverages
Have 5 of their cabinets, three under the work bench and 2 six footer storage cabinets. Work very well. Putting the wheels on is kinda of a pain, but once that is done they appear bullet proof. Like the gray as it matches my floor and lower portion of the garage walls. In cabinets you really do get what you pay for. Buy once and never look back. *****.