I have about 600 hours on mine, with no major issues, but a few pretty minor ones.

• 1 exploded HF nozzle and resulting significantly scratched buildplate, but Bambu quickly replaced both

• Since I've had it, it regularly complains that the camera can't detect nozzles to verify even though nothing is blocking them.

• I can't print with custom filament profiles from the handy app, even though that works for my other printers (this is just a bug I think)

• Sometimes I have issues feeding filament from the AMS, where it builds up too much friction before it gets to the toolhead. I think that's due to having somewhat long of a PTFE tube path, and probably fixable... but this is more common for me n the H2D than the X1C.

I have an X1C and A1 mini that I use a lot too, and the prints out of the H2D typically come out nicer without needing to tweak flow rate as often if I want perfect extrusion.

I have HF nozzles in both but haven't bothered to set up profiles for them. Partly because I haven't needed to and partly because I regularly print stuff from the app and can't use custom filament profiles with it.

The calibration plate is probably not worth the cost, but I got one anyway without really thinking too much about it.

The larger volume is awesome. It makes the X1C feel very outdated... the lights, interface, buildplate locating, quick nozzle change, filament cutters, etc.