The 'generic Chinese' mud flaps were once (I don't know about now) pretty prevalent across eBay and Amazon, sold by dozens of different sellers with weird names but an otherwise identical product, even if marketed differently - I chose one that I thought was flexible but on receipt it was just the standard ABS version that the seller had oversold the (non) flexibility. It was a case of choose how much you wanted to pay, or were prepared to wait (the cheaper ones shipped from overseas) and how much you trust the seller then pick the seller. Sounds like now, as well as having the choice of black or body coloured, you need to watch out for the screw or clip types.
We have the screw type and didn't bother with the top screw, not least because it would rust out in a few months. Not had any issues from it not being fixed up top although there is a bit of a gap, but we do have PPF around those parts to prevent any rubbing.
I was initially disapointed with them, having expected them to be more flexible (for reasons of
@Roy W. 's earlier post of stone damage) but tbh, they do a useful job at keeping most of the big debris off the car (lots of pine needles around these parts) and if you treat them as something that may need to be replaced occasionally then certainly a worthwhile and easy fit.
