Thanks to both of you.
My only concern is winter use. I know that the only real answer is dedicated winter tyres for use on light snow, ice or when the tyre temperature is (typically) below 8degC. However these specialist winter tyres wear rather quickly when they heat up on a normal highway surface. As 99% of the year (including much of the European winter that I spend in the Alps) I'm NOT driving on light snow, or ice, or freezing roads, and the X-drive is very good, an All Season tyre is the practical answer to my need. So, are we sure that these Dueler H/L 400s are acceptable in winter HIGHWAY driving conditions. (I have no interest in deep snow, sand, gravel, stones, in fact any "off-road", and so on.....)
Thanks(again) in advance for any replies