I got the same exact model back in December, I think it was on sale then because I got it for under 60 bucks. They are the perfect size for a home shop as they aren't massive but are still big enough to put a decent size part on. Only had my height gauge for about 3 years, an eBay special. Doug from Metal Works Machine Shop was kind enough to give me a mostly complete surface gauge, I just had to make a scriber for it. Made a base with leveling feet for it as well, just welded together some chunks of bed frame and made some threaded bosses.
Was originally thinking about getting a sink cutout from a granite countertop store, but then saw these. For the price, you can't beat them!
The cost to verify it far exceeds the cost of the plate. They are counting on that! LOL
Some guys on another forum tested some of the clones when they had their own big boy plates tested. Some were surprisingly good & within spec. Then, the odd blooper.
Even at Grade B rating, it's still better than trying to take comparative measurements and scribing layout lines on my mill table. And, it was affordable enough to justify. One of the first things I did was to check my import 1-2-3 blocks against the gauge blocks using a DTI. Was happily surprised to see that the blocks were indeed within the .0001" spec.