I've used Pirelli Scorpion M&S tyres on a BMW X3. They are 'All Season' tyres. Contrary to your ^^ statement I found them fantastic in the snow. Actually went out purposely finding untreated lanes in the Peaks with snow to play in. The tyres performed brilliantly. Come summer they were fine and wore well - lasting over 30k miles. I saw no compromise at all in their use in 3 years of running them (2 bad snow/ ice Peaks winters).
I pick a RX450h up in the next few days which has Dunlops on and will be putting the Pirelli M&S tyres on that when they want changing. If anything like as good as when on the X3 they will make a perfect all year tyre without the need for seperate winters.
I am sure you didn't, but then you did not compare them directly with summer tyres in the summer and winter tyres during the winter snow, they ARE a compromise regardless, of course they work, just not as well as a dedicated tyre. There is no debate about this, its a fact.
Yes I did, as we ran summer/winter and All Seasons, but what the point bothering trying to share experiences with dramatic pedantic posters like you? Wish I hadn't bothered and I certainly wont again.