I'm also pretty sceptical. There have been many tries at ducted wind turbines and none have had gains that make the extra materials even close to worth it over the larger counterparts.
Many have also hindered the performance of the blades by themselves.
If you really have an application where you don't have the space to put up the larger counterpart and you're ok taking a big gamble on this, go for it... I just recommend for the average user to stay away until it's proven more effective.
The burden of proof is on them and you can't get that from an ad.
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