I have high quality UPS with over and under AVR but in new house have some very bad problems anyway. I think it may be some sort of grounding issue but am just not sure. Electricians looked at it early on just after build when we were losing light-bulbs (incandescent) and they did a bunch of thing to the system and most problems are gone but there are still problems.
I have lost 3 laser printers since moving. Every time we have power outages and it comes back on I worry. Fuser in printers / CCD in scanner seem to have been the issue.
No problems with either CIS (led) scanners or ink jet printer.
Laser printers were plugged into surge protector but not UPS.
But even my computer that is in a quality UPS seem to have been damaged by power outage / restart. I have Gigabyte X58A-UD3R and it has various sort of extra "power" related feature and after problem, system would only work stable after I disabled most of those (usb power charge, etc) and also had to flash bios back one revision (to Fg1) because the Dolby stuff enabled in next bios flash did no longer work.
I have heard of houses having bad power before but not experienced it until we bought newly built home and moved in. Very frustrating and expensive. I have given up on laser printers and now use Epson Artisan 837 instead, which seems to have no problems at all so far.