These look pretty nasty. I have been shooting the SpitFire Maxx for years w/ tremendous success... I will certainly check these out further.
Got this from one of the guys at NAP this morning. Shot it in Iowa yesterday with the SF DoubleCross.
My thoughts too. Everything that I don't like about mechanicals, doubled. However, for the mech fan, they look interesting. I wonder how much energy is used to open both sets of blades.