CSVT1214
Addicted CEG'er
It is not as hard as the BFG KDW or KDWS, but those things get really noisy as they wear and have the traction of a railroad car iron wheel (well maybe not quite).
I've run both ZRi's and KDW2's and the ZRi's don't even compare. The KDW will grip in almost an temp, and wet or dry.
My Fuzions were sticky as hell in the summer heat, but anytime the ground was cool, they slid like hell. Wet traction was not what I expected either.