Greetings,
I have used the Performax workbench, tool chests (rolling) and wall cabinets in my previous garage (most of the pictures have been taken off-line, as I don't own the house anymore). Being Canadian, it took a 3 hour cross-border efforts to get it all, so I definitely had to work for the purchase. Here are my thoughts on each item:
Wall cabinets: Knock-down "build yourself", out of 8, one had issues going together, but I had to "live with it." They felt okay, but are somewhat shallow, and really tall stuff limits you to using the bottom, and no shelf. I used a 1x6 on the wall to hold them all level on the wall, which definitely helped. I would give them a 9/10 for value for money. I believe they were under $100 when I purchased them.
Workbench: I combined it with two roller cabinets underneath. This didn't allow me to "sit and work" comfortably at the bench. However, once mounted to the wall (via some "U" brackets) it was sturdy. I also had mounted a vice on it, and the top was definitely "tough". It did get greasy easily, as its unfinished paper / wood material. I wasn't concerned with it, as I used it for work. If you are going to use it alone, I would give it a 8/10, with rollercabinets, 6/10.
Rather than buying the Performax rollercabinets, I would highly recommend the Masterforce toolbox (2 piece). I believe the 41 (or 46 inch) has a nifty pull-out workspace, which in essence, is a workbench (albeit not with a wall-supported vice). This toolbox, combined with the Performax uppercabinets and / or large floor cabinets, with workbench make for great storage.
Now with the Canadian dollar trading at 70%, these Menards deals aren't so great. Sigh.
Note, my cabinets were in a heated garage, but in a climate that went down to -45 Celcius.