Hmm I know there used to be the issue with the aluminum beds being warped -- mine is like that but was resolved with some layers of aluminum foil under the glass to flatten it out. And I do hear occasionally of someone getting a unit with an incorrectly cut rail length, but they've always just called Creality and gotten a replacement without any hassle. I haven't heard of anyone having trouble with their customer service though, so I'm not sure what changed there, but that's unfortunate that you had trouble with them.

I do agree about the hit-or-miss quality though. My own experience was the first glass bed I got from them was absolutely fantastic, nothing else beats the adhesion I had there. Then after a few years when the coating wore out I ordered a new one from them... and nothing will stick to that bed without using hairspray/glue/etc, so what's the point? I finally settled on a slab of G10 with a PEI sticker which has worked well, but just the fact that the two glass beds which should have been identical says a lot about their quality control. I would say anyone getting an order from them should not expect a working machine right out of the box, however replacement parts have been easy to obtain for most people. And since you have to assemble these yourself, you definitely need to pay close attention to the online videos (I used the one from Tomb of 3D Horrors) to make sure everything is properly squared up, otherwise you'll have nothing but trouble if you just slap them together.