The rubber is definitely the stickiest I have come across.
Clean them up after each run and they are still excellent, The wheels are slightly softer than usual so they never crack, the tyres last ages, the only problems have been the glueing, which is now better and the hex part of the wheel.
There were problems were the hex bit was rounding out, I think due to the softer wheen material, this has also been redesigned slightly.
I'm not sure if they are available in the US, these were designed for use in a specific race series here, and the changes have come from feedback from this series. As mentioned, the grip is almost too good.
Racing on Sunday I went to Sorex 28's after a few rounds, they were 0.5s slower.....I went back to the Sweep's
I have asked the organiser of the series about whether these are available elswhere and I'm waiting on his reply.
Skiddins