My car has an MGW composite race knob, and I love it. Never scalding hot, never ice cold. Contoured with an ergonomically *superb* shape, its my favorite aftermarket knob to date on anything I've owned.
Even better... when I placed my order this morning I asked about the knob and they tell me that the composite race knob is still the same shape but is now made from a less slippery material. It's not as textured as the gripper knob but not as glossy/slippery as the original race knob. So I ordered one of those as well.
BTW, the discount for forum members is only 5% but that's still nice to get.