Was switching in-between my Arc10 and ArcFB today, wasn't as bad as before. The overall feels the same e.g. stiffness and weight balance but I definitely notice a difference in swing speed. I was trying to break the string on my Arc10 today as it was loosing tension, so I smashed a lot today. Not only did I not succeed but I tire my arm till it was sore and almost numb. Thus I went back to the FB, I was so satisfied with it =) the reaction/ maneuverability is just astonishing. I'm out of words to describe the feeling that I had, it is something like a child's joy when he receives a new present or like a feeling of daring childishness (being gutsy enuff to do something that you've never tried before). Yeah, it is always a joy for me to use this racket from time to time.