This is an old thread and a late reply, but Stofanel, I have not specifically, a few folks have used different variants of them, and a graduate student of Professor Battle Brown at Carnagie Melon University used two identical 9 inch diameter sets in a wind tunnel study of different power capture schemes in a study for his thesis. I do not have a copy of his thesis however.
That said an old saying is that the difference between good blades and reasonable blades is less than 5% added to the diameter in terms of energy capture. Of course a larger diameter puts more mechanical stress on everything, but everything is a compromise, that is the difference between the theory and the engineering. An alternator optimized for low wind speed will cook at high wind without furling or braking. Most of the big home built machines are optimized for the dominant windspeed, not the highest energy and used off grid, because the batteries are the limiting factor, you have to find uses for the extra power in times of high winds, and extra power there doesn't generally help much unless you can shove it into the grid, which for a remote site is not possible. Therefore such machines are generally optimized for lower wind speeds. Rich