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Works like a champ. Kept my modem, router, and home-sized laser printer running through a blackout. Instructions say not to plug in laser printers, but this seems to refer to industrial sized ones, as mine works just fine while plugged into it.
I've had a few cheaper UPS over the years but finally replaced them with this and it's been great. One major advantage is they have good software which makes managing it and dealing with alarms etc much better. The battery seems to have lasted along time too and still holds a charge.