So I went with the PR4s. . Once I scrubbed them off a bit for about 20kms on tarmac, I put them through their paces. My initial impression, on the road they are great - the first set of twisties had me grinning, they just roll in and out with the slightest urging. Then I took them on to a packed gravel road (see pic) and I have to say I felt less confident than on my Scorpion Trails by a long shot. It wasn't that they were bad but with a bit of hard gravel they get skittish. I contemplating letting some of the air out, but far haven't done that yet.
But once again, I really am happy on the dry tarmac so far, and they are better than the Pirellis on the dry road. The rains will be here in a few weeks or maybe sooner, so then i will see how they are then (I hear they shine in the wet, so to speak).
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
- Albert Einstein (1879-1955)