Having a bit of tendonitis at the elbow, I have been demo'ing a friend's PK 315, the latest model/PJ. Although I don't think it is any more arm friendly than my PSLGTs, I have to say that I like the PK 315 better than my Pure Storm Tours. So, last night I went to TW Europe to pick up a pair and noticed that the flex rating is 67! TW USA reports it as 61 and my arm reports it at closer to 61 than 67. I could definitely notice the frame bending when pounding forehands. TW USA: http://www.tennis-warehouse.com/ProKennex_Ionic_Ki_5_315/descpageRCPK-KI5N12.html TW Europe: http://www.tenniswarehouse-europe.com/descpageRC-KI5N.html Evidently TW Europe is reporting the unstrung specs. Does stringing influence flex that much, if at all? So, I went to the PK site and they are stating the same specs as TW Europe with 67 RA. Is "RA" the same method that TW USA uses? So, will the real flex rating please stand up? I will probably listen to my arm and not be afraid to buy this racquet, but being at the beginning stages of TE I have to be careful.