I'm currently working with Pirelli to get some money back - i think i must have a defective set. My ride (01 X5 4.4 w/19" wheels) is all over the road with these tires and have run through 1/2 of their usable wear after only 8,500 miles.
Pirelli has committed to refunding 1/2 and maybe even 3/4 of the purchase price (we are still negotiating), which is something, i guess as they say they don't have to warrenty them at all as they are a 'high performance' tire.
Currently I've removed the Pirellis and am back to running my winter Blizzaks till i get this sorted out.
We'll see how it works out...
Also - those Scorpions are the scariest tire i've ever driven in the snow - i felt like an epileptic ice skater on a recent Donner pass crossing.