Early days yet, only been fitted a week. No condensation first two days, but very cold next night and some condensation on windows (but also had wet washing indoors) so turned up air flow from 3 to 4.
The house definitely feels drier and airier. Feels a little draughty on the landing and cooler than usual but not uncomfortably so.
No noise from fan (and believe me my partner has ears like a bat, especially for sub-sonic hum so this was a major concern) we can only hear the sound of rushing air. Slight loft smell initially which has all but gone now.
I installed this unit myself and was pretty simple to do; ran a spur off the lighting circuit to a twin socket, fitted a plug with a 5a fuse and suspended unit from a rafter on the supplied cord. No probs-an easy DIY if you are comfortable with electrics and don't mind working in the loft.
Will be buying another unit for a rental property with bad mould and condensation problems. Also daughter wants one too, so will be fitting one for her. I have given 4 stars as I have not had the unit running long, and time (and Winter) will tell if it deserves 5 stars. I hope so.