I got a couple Qidi's. Not too bad, just know that some of the extruder parts aren't compatible with Flashforge. The barrels of the thermal tubes are bigger in diameter. If you have to replace a thermocouple you can't use Flashforge ones. Qidi changed to a 5mm thread size on the thermowell mount into the hot block.

Qidi z axis isn't nearly as robust as Flashforge is. They still use 8mm guide rods and Flashforge changed to 10mm about a year and half ago. It makes a big difference in lateral stability especially when the build plate is in the middle of the up/down travel with the flex is most noticeable. The metal platform on the Qidi seems to be much more flexible than the Flashforge also. I have talked with Qidi support and they said next run they would look into upgrading the Zaxis. Funny once you say FlashForge does something they scurry and say we can do that too..lol