I've done over 35k miles with my Fazer and changed a lot of different tyres, including Bridgestone, Metzeler, Michelin, etc.
The last ones I had were Michelin Pilot Road 3 (I think it was 3). They were great.
I usually do 70% city and 30% open road driving, they were good because they lasted long and actually handled very well.
I ran them at 2.5bar front and 2.8 rear.
Then I had to change them. Visited a local bike tyre shop (guy specializes for bike tyres). After talking to him, describing my driving habits, etc. he recommended me Diablo Rosso II.
He said they were good all-around tyres and that they will last long.
On the first ride they handled like garbage, slippery, unpredictable. Very unreliable.
I thought it was because it's still new. Gave them a couple of hundred kilometers to "break in".
Nope, still garbage.
I've done ~1500miles on them by now, and they still suck.
They're good when driving straight, but once you start leaning through corners they start slipping unpredictably. They're very strange, in a bad way. It's like that they slip a bit each time you change tilt quickly.
They're also not very good for going fast through long corners while leaning. They constantly slip-hold-slip-hold-slip-hold.
Now, I read reviews on the internet and people seem to be really pleased with them, so I wonder who's crazy here?
I run them at the same pressure as I did Michelins. I found it provides for faster leaning.
They were new when I bought them, I checked the date.
I had to write this because I still can't believe how bad they are, and now I'm stuck with them, which pi**es me off.
They're so bad, that my friend told me he saw them bobbing (letting go) while he was riding behind me last weekend.
Sorry for funny words, but English is not my primary language