Large MFPs and WSD/XPS are big No-no.
Maybe for smaller A4 USB home desktop printers they are OK but IMHO no MFP with LAN port should be using them....
On those 2 machines both K drums are really at around 150k counts.
And drive count matters also they've look doing a lot of color job vs monochrome....
Last week this customer called me and said he had yellow streaks on the print. In the morning everything was still good and they replaced the yellow...