Go figure...works great for me and several folks here. On our track about 2/3-3/4 have been running Niftech for about 3 years now, the rest generally use Jack.

Something we did for our 2-day race last spring was put some Jack in a spray bottle and spray a little down in a strip on the straight on Friday when the track was completed. This tracked around and the track grooved in very nicely. No one, even the out-of-towners who often complained about the traction, had a lack of grip.