I've ordered from both Slide-A-Shelf and Shelves That Slide, and I'm hoping my perspective will be helpful for others.
First off, Shelves that Slide is the winner. If you're just looking for that answer, you can stop reading here.
That said, let me break down my experiences. In both cases I was ordering online and planning to install these myself.
Customer service: Individual experiences may vary, and I'm not trying to talk negatively about companies that are trying to do a good job, which I think both companies are. That said, Shelves That Slide (STS) made it easy to order from them. Slide-A-Shelf (SAS) has created a system that makes it less expensive and faster for the consumer if they order from either Home Depot or Amazon. I'd rather deal directly with a company if they're good.
For both companies, I reached out with questions. With STS, I was impressed that Steve was prompt in his replies and seemed to know who I was. The only way I was able to get SAS on the phone was to leave a message and wait for them to call me back. Now, to be fair, Covid-19 probably means lots of companies are testing the limits of their customer service and manufacturing teams. Still, I have a strong impression that if I ran into the same issue with both companies, I'd be better supported by STS.
Quality: My SAS shelves both had a gap on the front left side, but no issue on the right side. My STS were uniformly constructed with the same precision at each joint.
The SAS shelves have a piece of wood in front, the STS shelves don't. While it might look nicer, it forces you to mount the shelf deeper, which means you lose just a little bit of length in how far out you can open the shelf. (The rails are the same length)
The STS shelves are flat, the SAS shelves are lower in the front, raise slightly, and are higher in the back. It's a nominal difference, but you can tell them apart based on this.
The STS shelves are less glossy, the SAS shelves seem to have more polyurethane on them.
The STS and SAS materials and designs seem pretty similar. Based on some frustrations with the sizing and manufacturing quality of the SAS drawers, I haven't tried to install them, I'd like to return them. I am very happy with how straight forward the installation process of the STS drawers were, how well they work, and my wife and I have gone back and ordered what we need to finish putting them on each of the pantry cabinet shelves.
I'm a big fan of Shelves That Slide, and if you're on the fence, order one or two, make sure you know what you need, and then order the rest once you've got the confidence in the measurements and installation. They're exactly what we were looking for, and I'm glad we ordered them. read more