I have only about 5000km (3200 miles) on my PR4s and I am not overly happy with them.
The grip level seems to be OK although I have had it feel "vague" a couple of times on fast wet bends.
The rear tyre is noticeably "squared off" already. The front one seems to be wearing evenly but has already lost nearly 1mm of thread.
I always run them 2-3psi above the Honda recommended figures.
The main problem I have with them though is the noise factor. As they wear they are becoming very noisy. Many of our road surfaces in Southern OZ use "course-mix" bitumen and the surface is very aggressive on tyres. On a smooth surface they are very quiet but on a coarse surface they "rumble" quite loudly. It is clearly audible above my music and wind noise.
The first time I noticed it I thought that one of the pannier lids might not have been closed properly. It is that hollow, plastic, rattling type of sound.
I suspected all sorts of other possible causes and it took a few rides to track it down to the tyres.
The old tyres that came off were Michelin Pilot Active and although I was never confident in the wet they did 27,000 km (17,000 miles) with still about 2-3,000 km left and they were absolutely quiet.
I chose the PR4s to get the best possible wet grip but at this stage I am not sure that I would buy them again next time.
Macka