They are all same. I bought different brands and noticed that the lockring on which brand name is printed comes in its own little pouch sticky-taped to main cassette body. One manufacturer is producing those cassettes and ZTTO, Wuzei, Goldix, Sunshine just add brand lockrings on top and make it theirs. Those mid range lightweight cassettes are really good. I am yet to try scary light cassettes like Riro branded.

Good outcome!
I guess the morale of the story is, stay away from non standard features. A round seat post is best. A D-shaped seatpost with a "standard" clamp, we've seen on dozen of bikes. But the clamping system on this one just doesn't make sense.

So far I'm quite pleased with my ER9 groupset. I've been riding it back-to-back with my mechanical Ultegra bike and they're both good in their own ways. In my opinion, it's similar to driving an auto assist car versus a manual transmission. I find installing the ER9 easier than mechanical, but it's faster to tune mechanical once installed. Though I wish there were RD cage options with the ER9/X. The one thing I like with the OSPW Ceramic Speed knock-off I'm using on the Ultegra bike is the 4 levels of spring tension. For someone like me who climbs and descend rough California fire roads the added tension keeps the chain from bouncing without having to use a clutch RD. LTwoo's looser cage tension and smaller spring are a bit bouncy on rougher roads.