From my limited experience with these wind generators, looking at the market place and comparing to other manufacturers these generators are produced on a budget. Only having a front end bearing to support the rotor instead of having 2no front and back, all the load forces are concentrated on the the front bearing. It goes without saying that this set up cant last that long without a strip down for either a shaft or replacement bearing before too long. However if your looking for a inexpensive solution and your prepared to spend a little time to maintain them raguly, they offer reasonable value for a low power return. Also if you live in a built-up arear surrounded by trees and tall buildings the continues winds required to run these little chaps isn't there. Open spaces will produce a far better result with a lot less wind turbulence.