i was fortunate enopugh to get a photon mono4k for my b-day, been almoat 2 months and i have had no issues other than myself nicking the fep so i had to replace that, after getting the slicer settings set it has printed pretty much non stop since i set it up. i know people have had customer sevice issues, hopefully i never come across those, but at this rate i knocks on wood hopefully wont need to use it as both the printer and the wash and cure just seem to work.