Well, I got the BH head on today, and it is sweeeeeeeet! easy upgrade, took me about 15 minutes to get it on and another 5 to get the blades tracking right afterwards. I have noticed an increase in stability in hovering, and the cyclic response seems to be greatly increased. The weather is in the toilet here, so it will be a while untill I get to fly outside.. but doing some quick right stick manuvers inside seem to indicate a great improvement!