I've been using the VT 50 E-Tune for a while, and it was good. I took off the e-tune parts it's becoming, eh. I'm pretty sure they don't weigh enough to do anything, but they just provide extra air resistance, make the frame a bit... bigger, add some air resistance. I'm thinking of going back to the Li Ning N50 III. The N55 III has been on my list of maybe I'll try it for a while. Could always try the ZF2 again - this time 3U, maybe the LD-F? Either way I'm still the same style of player, hate the midcourt, strong drops, angled smashes, tight spinning net shots, and injection of pace in the forehand rear court corner as opportune. Any suggestions?