I have been testing some, the screw in version, and I am mighty impressed. Mine do hiss loudly, which bothers some people, others could care less but it is the ONLY potential draw back on them I can find. Super strong, very high quality and excellent grind, fly laser straight man do they get sharp.
I'll be messing with some glue ons next, I believe they are worth checking out. I'm curious to see if the differences in the ferrules has any bearing on the hissing. I also want to further experiment and determine if arrow set up has any effect on noise.