I've been playing with the DNX 8 for over a month now and had a brief chance to try the two Pure Drive's yesterday in some doubles with big hitters. The Pure Drive had an extra grip on it, which may be why it weighed 11.7 oz, but based on playing just a few games with it, I was producing similar balls to what I do with the DNX. I could clearly feel vibration, even on softer hits, and didn't like that at all. I remember it being more comfortable last time I hit with it, but not this time. And it's strung with Sensation! The cortex system in the Roddick pure drive clearly does it's job, but produces a feel I didn't like much. It was comfortable, but not enjoyable. Maybe too muted. Anyway, it swings as it's swingweight suggests, which is too much for me, so I didn't spend much time with it. I may not spend any more time with Pure Drives, so I figured I'd post my opinion even though it's limited.