I was very impressed with it!
It was pretty logical, and nicely designed for the most part. I know it's still work in progress but I liked it so much more then MT. I used it on a 1.0.73 ECU, so I didn't use any new or special features.
But I thought I'd leave some feedback, and I'm hoping to upgrade a few ECU's to newer 1.1.x FW soon with it.
Has anyone else completely ditched MT yet in favor of VEMSTune? I obviously still have MT installed, but I'm going to try to use it less and less now.