Very easy to install. Bought to replace thirty year old fans. Works best on high speed when amber LED is on and window is opened slightly to allow enough fresh air for circulation and condensation not to accumulate on the face of the fan. Super quiet operation you cannot barely tell the fan is on. Also energy star rated! Definitely worth the it!
This is my second Delta breeze exhaust fan. It is so quiet (and uses so little electricity, I just leave it running on automatic mode (blue LED) constantly. The only time I find condensation on the mirror, is when a guest mistakenly turns it off (after using my bathroom).