My wife and I bought one of these infernal machines and next to nails on a chalkboard and Ashley Simpson, the shrieking that comes from the slow-dying motor is absolutely one of the worst noises I can think of. I have been woken from a dead sleep many nights to the tune of "clogged feces."  If you haven't heard this tune, let me describe it for you. Combine a five year old playing the electric violin for the first time with Fran Drescher and add in a few seconds of dead silence in two or three 15 second intervals.