This agrees with what little I remember. Energy you can get out depends on swept area, and these don't have much of that (different rules apply to funnel designs like this one but the concept is still applicable). Wind close to the ground is too turbulent to get much power out of as well (imagine how many times it can change from blow to suck and back in a minute). They could have solved these problems, but I didn't see anything very different at their website, just creative funneling of air through a turbine. I wish them luck though.