I've had these on my Bike Friday NWT for over a week now. Tonight I rode from Bed-Stuy, Brooklyn to the West Village over the Williamsburg bridge and back in very slushy, snowy conditions (got to experience the very excellent new bike lane on Bleeker). The GKs grip my sneakers very nicely. My feet feel really stuck on to the pedals. It seems that the length is what makes them feel like this. I also like how narrow they are since it's fun to pedal while turning. The first day I got them it was rainy and my sneakers seemed to slip a bit on them, but tonight was pretty wet and I didn't have any slippage whatsoever. So far I feel that the name Grip King is very apt, though I'll be on the lookout for any slippage like I experienced when they were brand spanking new, maybe I just needed to get used to them. I also feel like my pedaling is more circular and efficient than ever with the GKs.