I've currently got an HP LaserJet 4050dn here in IT, and a standing threat to shoot anybody that tries to wander off with it.
That is my main workhorse too. Got it used from a client with 65K pages worth of use on it for $50. It's still going strong. The 4xxx series was one of the best HP ever produced IMO. I also had a LaserjetIII (with Postscript cartridge!) that I bought new when it first came out. That "boat anchor" performed yeoman’s service right up until the day a client's 3-year old kid (an out of control little brat if there ever was one!) yanked the PS cartridge out and then rapidly plugged it back in three or four times in a row while the unit was running. After that, it would only print two pages at a time before a print job timed out. It got replaced by a Laserjet 4 the following week.
When I ran (or rather was) the IT department for a rural water utility, I spent more than a few hours arguing with the people who used our 4050 because they wanted a new printer. It started life as the billing printer and got handed off to their department after being replaced by a 9150. They eventually managed to get their way just because they needed to be able to run 2 print jobs at a time. IIRC I got them a pair of 4250s for that.
Since I couldn't stand to let it go to waste, I shuffled it over to the woman responsible for the members' monthly newsletter. In reality, the only reason everybody hated it was the noise. I guess hated the noise too, but it was the one coming out of their mouths.
Personally, I would have traded the lot of them for another 4050. It was more productive than all of them combined. It also never helped defraud the FDA out of $45 million dollars.