I'm like you. I got to where I was hitting my groundies well (good singles stick) with the VE10 MP, however, I found myself not liking it on the serve and volley in doubles. This summer I will be playing a lot of doubles for my league team.
I still have not played many singles matches with the DNX 9, and am still trying to work some things out with it, but I'll tell you what I've obeserved so far.
I like the stick a lot. I think there are more similarities than differences with the PPRti. I've got them weighted and balanced identially at 347 grams.
I am able to string the 9's at 61m/63x where as I was stringing over 70 with the PPRti to get the control I thought I needed. This will be a huge advantage in terms of wear and tear on the body. So far the DNX9 has been better on my arm. I think a lot of this has can be attributed to the sensor tour handles in the Volkl frames, and it might be a shade flexier (or at the very least it flexes differently).
Serve: I give the DNX 9 the advantage on flat serves. it has excellent pop and great directional control. My T serves have never been better. Might I add I like the DNX 10 for this also. I feel that I can consistently hit the short angle slice off the court on the deuce side better with my DNX 9. I feel that I give the kick serve the advantage to the PPRti. That is a minor trade off, and think I can still get the jump I need with the 9.
Volley: Very comparable. I have not played with my PPRti's since August, however, I cannot pick up any noticable differences. I'm volleying well with the DNX 9, whereas I felt like I struggled with the VE10 MP.
Groundstrokes. Both racquets slice very well when stretched wide. It's conceivable that the PPRTi's sweet spot might be a shade wider, however, this has not affected my game. I feel like I am hitting my 2h backhand top better with the 9. I am still working out some issues on my forehand. This is my strength and I go for some major big and low percentage shots with it. I really think that the 9 has a little less pop off that side, so when I miss it's in the tape a lot. I've drilled a couple of times recently and it's coming along. Time will tell, but for now I might give the overall edge on the groundies to the 9, however, it's a little soon yet.
As you know, it's give and take with anything. So far I like where the Dnx9 is taking me. Hope this helps, and I definitely think it's worth a shot! I feel it's an excellent frame that deserves attention. A racquet that's pretty good at everything and maybe combines some of the old school traditional Volkl aspects of a frame with some contemperary aspects of some of the popular advanced players frames made by other companies.
Take care...
