Wow, looks very cool. I wonder if you can mount these on a pole as well.

Payback period: The Energy Information Administration lists average U.S. residential electricity prices at 11.23 cents per kwh, as of February 2009. A turbine that puts out 2000 kwh a year saves $224.60 annually at that price, making the payback period just under 20 years on a $4500 panel. (The government rebate would lower the payback period to about 14 years.)

...that's if you have Class 3 wind resource (~12mph wind), which is a pretty stiff average compared to where most people live.

Most people would get as-good or better payback out of PV. Don't buy a turbine without a fairly careful wind survey (which is far more time consuming than a solar survey.)

I have been in the business for 20 years and have seen many gimmicks and this is probably one. You cannot extract much useful energy from the wind at rooftop height period! Please don't waste your money on this yard ornament!

Here's an article that explains what to expect in terms of power output from the Honeywell.

Yep- ~67kwh/month, 800kwh/year at rooftop level, even in a fairly windy spot (have a steady 12mph?)- not exactly a great investment compared to, say, insulating all your hot water pipes or 1000 other modest efficiency upgrades:

You'd do about the same buying a clothes line and air-drying your clothes.  (modest cost, requires lifestyle adjustment)

You'd  double that with a drainwater heat recovery heat exchanger. (At 1/6 the upfront cost of the turbine, no user input required.  Even the heavily subsidized turbine has a similar cost to unsubsidised DWHX, as well as ongoing maintenance.)

And if you don't experience a pretty stiff breeze most of the time, fuggedaboudit- payback will be 3 months after never, even with large subsidy.

But if you want to show off your greenliness to the neighbors, it kinda makes a statement.

(To me that statement reads "I don't do arithmetic."    )