I love everything about the switch from the Dunlop Revelation Select Pro to the M-Fil 300 except the increased shock to the arm. Obviously a lot of that is caused by the lower weight of the M-Fil, and hopefully it can be corrected by weighting the raquet up. I'm sure the poly mains don't help, but I used to string the Select Pros with nothing but Problend and never had any problems. All that said, with raquets getting lighter, you'd think the shock absorbing handles would be even more important. What gives?