I had mine at Sebring with stock GTPP suspension and had no issues but I'm a novice.
You'll get some great answers here:
http://www.mustang6g.com/forums/forumdisplay.php?f=197
the rev hang is only a matter of a few seconds for me, it doesn't matter if I shift at 2400 or 3000 the rev hang is the same duration and only when cold.
Just saw this on eBay and thought anyone looking for a great deal may want to take a look. I have no vested interest just sharing.
http://www.ebay.com/itm/2016-Ford-Mustang-LEATHER-/162443269469?hash=item25d25f955d:g:o3QAAOSwal5YJI02&vxp=mtr