I use one. I got it to keep my back end planted on a high speed sweeper. I also angled the hell out of my wing adjustment on my car though as I installed the proline high downforce.

During jumps the car stays about the same as it always has. Every once in a while, depending on where you hit the jump, you'll still get a noser, not very often. The wing definately helped me keep the back end down in the sweeper though. I can't be for certain it was all the proline though, as I adjusted the angle of the wing. The stocker may have done the trick.

A side note, I haven't broken the wing yet. Its got 2-3 gallons or so on it.

Blue groove track, so crashes are pretty rough.