I've been really pleased with my Grill Grates that I bought so far for my Weber gasser. They provide awesome grill marks and my grill doesn't flare up nearly as much. It gave my the gas grill some new life. My Traeger only gets to about 425 so I like to finish/sear my steaks on my Weber gas after smoking them.
I did some grilled zucchini the other night and brushed on a "sauce" consisting of melted butter, garlic, dijon mustard, thyme and lemon juice. The sauce/basting liquid can be used on about any vegetables. The recipe came from a Sam the Cooking Guy video.
I don't have a Costco membership, but Kosmos Q mentions that you can actually get some pretty good ribeyes at WalMart and use the salt brine technique in the video below.
I liked the Grill Grates for our Weber Spirit 310, but man are they a ***** to clean. I don't take care of my grill nearly as well as my Traeger so it's probably my fault, but the channels are very difficult to clean without using a pressure washer. Finally tossed them after 3 years and will use the standard grates (hadn't unboxed because I had the GG's ready) until I decide if I want to buy new ones.