I have been demoing the dual core rackets for about a month now and they are definitely different from the x series. The dc rackets seem to be much more arm friendly than the x series. They don't have as much crispness or distinct feel as the x series but you can't feel any vibration even on off center hits. So you lose some feel but also gain arm comfort. I have been using the x 99 white for a while now and do like this racket, but i believe i am going to switch to the dual core silver light. For me poly strung close to 60 lbs plays the best in these rackets. So even though the dual core rackets have more power that i need to diminish, i can string them higher with no arm problems compared to the x series. I demoed almost all the donnay rackets, the best x series rackets for me would be the black,red and white. The best dual core rackets were the silver light and the gold for my taste. The plat. 94 had a unique feel, but i was disappointed in the spin and control this racket has considering it is supposed to be a players racket. The dual core silver was a rocket launcher with way to much power for me. I have not tried the newer xp models which i am not interested in larger frames with thicker beams. The thin beam donnays are one of the things that make them so unique. I have demoed and used many rackets in the last few years, but to me the donnay rackets are different compared to everything else out there. I would suggest to take your time and demo all of them because they definitely play different. Some will prefer the x series, while others will like the dual cores better. But they are all very unique rackets.