Milliwatt. I had the Pirelli Sottozero's on an A5 two years ago and they were excellent in little snow as well as on wet and dry roads. Not as noisy/aggressive as Blizzaks. I was considering them for the Z51 for winter rides (not for snow unless caught off guard). I notice you mentioned the Alpins but not the Sottozero's. Have you heard anything negative on the Pirellis?