My friend's husband got his machine and she said she had to go sleep in a different room, it made so much noise. Then she said that the next morning he woke up looking ten years younger, with lots of energy, smiling and laughing so much she wanted to slap him.
I assume she got used to it, because she hasn't mentioned sleeping in separate rooms again. One family we camp with has one of those machines going all night for the dad. They usually camp a little farther away from us, so we don't hear it. I wonder if I'll have one of my own when we camp in November!