Alright guys, why would it be a bad idea to get one of these? Too expensive, not enough power for the money?
I have a home on the windward side of the Big Island of Hawaii just north of Hilo.
Average wind speed is over 20 mph.
Thanks!
400 kWh/month for 15,000 dollars with a 5 year warranty? Electricity in Hawaii is about 36 cents per kWh according to a quick search. That works out to about $1700 dollars a year if you have an average windspeed of at least 12 mph. This is a payback period of about 9 years. If the wind blows more, it will payback much faster.
Of course this assumes you simply sell the power to the energy company at full cost if you don’t use it.
I believe the 400 kWh/month is a best-case scenario, but that’s still not bad. These little home turbines make a whole lot more sense in Hawaii than they do in the lower 48, though. I won’t torture the OP by telling him what my rate is, but my best-case payback period with this generator would be about 40 years. 
Skystream manufacturer website
compare with what local vendors and installers might sell. they will also give you much information, you might hire them to do a test at your site.