Installed my Raceseng 86er knob today. If I had a dollar for all the times I threaded it on and off trying to get it positioned correctly, I could have retired a year earlier. But the knob is fantastic, I love the look in my Firestorm FR-S. It is a little cold in cold weather but once it warms up, the feel is great. Shifts are nice as I can feel every gate.
BTW, Jarrett / Raceseng is wonderful to deal with - you can't go wrong ordering anything from them. Great products and service.