Wind as a source of energy sounds like a good thing, but there still seems to be some controversy. Like most things, it is important to look at a larger picture.
Location is very important for some obvious and not so obvious reasons. The obvious would be that there needs to be a substantial amount of unobstructed wind, and they need to be up high to catch the most amount of air. They should not be too close to populated areas, due to the vibrational reaction as well as noise (similar to a 10 mph wind). Many claim they suffer from headaches and tinnitus (ringing in the ears). Some say that sleepiness is increased from the ‘white noise’ they produce.