I would be careful buying generic products like this on Amazon with little reviews. Amazon has their money back guarantee, but to be perfectly honest they can't police all of the 3rd party sellers. As soon as one gets caught the same guy will just open up a shop under at different name and keep doing it. I bought some 304 SS baskets on there last year but they were copying someone who was legitimately doing it and got out of the market because it wasn't worth competing with all of the scam sellers. What I got in the mail was definitely no where near 304 SS and the seller was clearly buying someone else's baskets (even had them shipped from the other seller), marking them up $30 and defrauding others in saying they were a different material. Unforunately, this jerk probably made several hundred dollars or more before someone (me) decided to try a magnet test and called them out on it. I wouldn't doubt if they are still doing it though.
Personally I would just stick with a standard GBS grate and only use it when you want to use the accessories or are doing vortex chicken. I have one that I rarely use because I don't like how the center portion can fall out and wiggles around. I would prefer to give my money to Killa Grilla who makes quality SS products that ship out in hours. Who knows who this fella is on Amazon.
If you stick around the forum and/or facebook groups you will see which brands/products tend to trend among grillers for good reason. Good luck!