Easy to install and very powerful. Now a three speed model. Changing speed and overun time could be made easier with external switches rather than small fiddly (but clear) components on the circuit board bearing in mind these irtems are generally in a loft and access is not always easy. Only really need doing though initially, but only obvious improvement apart from a toolless cable connection (eg waygo levers etc). Great fan but be aware that the air speed can make a noise through a small grille opening.......