I've known some guys that have run them on their race bikes. They're trick light, so they really drop your unsprung weight and drop a great deal of rotational mass. However, they're really fragile and impossible to straighten. So only the richest guys would run them on the track, since one offroading excursion could be the end of them. As for running them on the street...I would never. The Empulse is kind of heavy...I'd hate to hit a pothole with mag wheels on the Empulse.
Funny story: When I was bringing the Empulse back from Tampa, I was cruising up I-95 when I hit the mother of all potholes my front wheel going 80 mph. My 3/4 pickup got sideways so badly, that the rear tire never went through the pothole. Then a quarter of a mile down the road, I saw someone pulled over examining his flat low profile tire on his bent wheel.
