I have a 3-mdqx-sc Little Giant that I bought direct from the factory here in Oklahoma City as a remanufactured unit (got a vendors discount, my employer makes all of Little Giants boxes), it was rather loud for a couple weeks, but its practically silent now, and still pumps its butt off. Runs a bit warm, but since the rotor head and volute are separated from the motor by a slight gap, heat transfer is at a minimum I would think. I've had it running practically non-stop since I bought it in August, hasn't had a single hiccup.