AlphaPapa,
My father has a Kirkland gasser amongst his cooking toys. Overall it has been a very good unit. His is ~20 years old and primarily stainless steel (I don’t know the content of the current version, but make sure at least the cooking chamber, lid and grates are 304SS or a similar grade, and thick). I was also impressed by the fact that the overall output is around 80,000BTUs across 4 burners, and the accessory side-sear burner works quite well. It was actually made by a major brand appliance manufacturer and labelled Kirkland which makes buying replacement parts a little easer. From my perspective, the burner tubes will require periodic replacement along with his anti-flare burner covers if your are in a high humidity environment or if it/they are exposed to acidic substances (i.e., bbq sauces, citric juices, and the like) that are common with his cooking style. As you are putting it together, toss out all the cheap fasteners and purchase aircraft (AMS or race grade) fasteners. You will thank me later when the tubes are replaced as the bolts/screws will be easier to remove. Overall, based on the insulation, ease of use, build quality, and Costco’s warranty, I give it a 7 for quality, a 7 for ease of assembly, and a 8 for versatility. This is a 9/10 across the board for the space in the outdoor cookery world’s mid-grade appliances sector in my book which is/was great for quality vs cost tradeoff. I know that doesn’t seem like a high rating but I use a Lynx Professional that was about $15K fully rigged so my expectations are not normal. YMMV as I said, his unit is over 20 years old and still kicking I suggest you take a look at the specs, not the sparkle of a new unit to see what you like before your purchase.