I've been running round on my winter tyres for a month now, not that there has been much cold weather to really see how they perform, so..
My 2011 IS-F takes Front 225/40/19 93Y and Rear 255/35/19 96Y tyres.
It was a complete sod finding front and rears from the same supplier however I am now running round on a set of Michelin Pilot Alpin P4s. They are not Y rated however I don't think I will be doing 170 in the UK in winter so I'm not too worried about that.
They are pretty good to drive on, a little more road noise from the tyres, (a lot more on one short concrete stretch of motorway I use occasionally) however I can say they are very good in the wet. I travel a lot in my job and I've been up and down the motorways during a lot of the bad weather recently and so far they have performed excellently, no hint of aquaplaning on flooded road surfaces and provide really good grip on wet and greasy surfaces.
So far, I'm really pleased I forked out for them.