I read a review for Windwill on The NYTime's Wirecutter that described the Windwill as the best looking and easiest to install unit. Apparently also great on electricity. The unit arrived by mail in 3/4 days, was installed in a snap, and looks clean. It is also very efficient! I see my electric bills on a weekly basis -- and even with the high and humid days of NYC in June - there has been little escalation to my electricity use - i.e. bill. Buying online can be hit and miss; the Windmill is a big hit!