I use the v core 98d with a full bed of poly. Is less stiffer than the pure drive gt strung with full poly and after 10 hours of play I can't feel any problems even with my shoulder with what i had some problems a month ago. I will play with the full poly until it breaks , lose all the control or my elbow or shoulder starts to be sore. I just want to see how many hours I can play with a full bed of poly.
now my other racquet the babolat pure drive gt is strung with synthetic gut. the racquets play almost the same ( same balance 315 mm ) but you can notice the lower swingweight on the Yonex