I have some chairs that I purchased from Costco back in 2000 that have held up great. The closest chair I have found to it can be purchased
here, the only difference I can tell between this chair and the ones I bought at Costco are the Costco chairs armrests are covered with padded fabric, everything else appears to be the same. Oh, and these chairs do not have any leg interference.
Here is a pic of of the current version of the Costco like chair and it has a weight capacity of 350 pounds for us bigger guys