I've tried them out and they seem great. As sharp as my Silver Flames out of the box and they fly great. I'm trying to match more setups with inserts/weight so I can use this very head.
I'm a stickler for sharp out of the box. These appear to be the sharpest out of the box I've ever seen. I know there's no sharpness scale, but these heads don't just shave hair in 1 swipe, they also remove all the dead skin you didn't even know was there and you have a little pile of cut hair and white powdery skin after a swipe. SHARP!