We have two. People complain they stop working; we bought two and had to almost immediately return one but since we got the new one we've had ours for more than a year and they keep going. They do get dusty so require periodic
cleaning. We also found that unless you keep them running all day, you cannot get them to turn on at night... maybe the
motor requires too much juice from the battery.
They
work well but do not expect them to cool the
cabin - they are just to move some air.
We put one in the
shower stall of the
head and another in our
cabin [but not above the bunk]. So if either develops a leak or seawater gets through it will just go into the
bilge.