they are probably the same as the ones craftsman, kobalt, and everyone else "makes".... head over to lowes, home depot, ace hardware, etc and check them out.
They should work just fine. Do as T.J suggests. At least you can see the craftsmanship of them. It should be close. A problem might be on how they ship them. Costco does not box product to be shipped. The will ship how the product is ship from the mfg. to you. They could have the company drop ship it to you. If that's an option. I ordered an engine stand from them. When it arrived it looked liked (the box) was run over by a truck. I was surprised that all the parts were there and in one piece. But like you said you can send it back,no questions asked.
Not much bench space. Lots of storage though.