Dealing with less than ideal road conditions is probably one of the most stressful parts of riding everywhere and every when. A few weeks ago, I changed tires, and suddenly road conditions have become an issue again. For the last 4 years I have been riding on Michelin Gold Standards. My old dealer did not survive after it's owner passed away last year, so in the process of switching dealers, the new dealer only carries the Pirelli Diablo.
My first impressions of the Diablo were very very good. Excellent grip with a very smooth ride quality. Really, as an general use tire, I was very pleased right up until I got on one of the local highways that unloved surface of concrete with rain grooves. This was when a first impression went very bad.
Tracking down the road, the Diablo's seem to have a fascination with going where the grooves go, and not where the bike is pointed. Needless to say, this is an uncomfortable feeling. Not a deal breaker, I do not spend much time on this road, and have plenty of alternatives, but it was certainly a rude awakening.