I used the Kendas at a race a while ago.
Did a lap in the dry, very fast.... Track got slightly damp in a small shower and it was like riding on ice. I'm not joking when I say that at one point, my bike turned a full 180 degrees on a downhill and I was facing up the hill with other riders barelling towards me. To this day I have no idea how I stayed on or how the riders behind me managed to miss me.
If you ever ride in anything other than bone dry conditions... forget it.