For the turbosmart valve it was 50/50 VTA/recirc. So same symptoms as running VTA, but only half as bad, lol. I still ran rich between shifts, so some stumbling/backfires (not major but enough to bother me). Also, it just didnt drive as smooth. If you accel normally and abruptly let of the gas, it just decels funny/jerky (due to valve). Put the stocker back on and things ran smoother and better.
Now I am just looking for something to direct replace the stock one...and have the ability to adjust the spring/tightness with mods in the future. Just don't feel so good about the forge sound, lol. I would like to hear it in person but I don't think anyone around here has one.