I have 2 generators, a Yamaha 2000 that I use to power the batterybackup which the laptops and readers are connected to.
I have a Brother laser printer solely plugged into the 2nd generator, Wen super quiet 2000 from Home Depot, 1/2 the cost of the Yahmaha. And, yes, when it kicks on you can hear the engine rev.
On a side note, the Predator generators sold by Harbor Freight were just rated as quite comparable by Consumer Reports to the Yahama for 1/2 the cost! approx $500.00