Mike- thanks for the feedback. To clarify, I only intend to run the x-ice December through April. Will go back to the all seasons otherwise. The michelins are also the same price as the blizzaks, which offer no tread wear warranty. Again I'm not concerned about a claim, just feel more confident that Michelin thinks they will last longer.
I think you misunderstood what I was attempting to say. The other tires don't have a tread life warranty. This means they can sell a tire that costs more to make at a slightly lower price point. The fact that they cost the same is meaningless because you don't know how much mark-up there is. The consumer always ends up paying for the tread life warranty and I would not use the fact that one tire offers it as evidence, in and of itself, that it will last longer than any other tire that offers no warranty. The others don't offer a warranty because it's problematic to do so with winter tires (the consumer takes the winter tires off before the warranty expires but the cars odometer is still racking up miles).
I agree the X-Ice 2's will probably last longer than say Blizzak WS80's and I wouldn't recommend the WS-80's for an AWD CX-5 for the same reason I don't recommend the X-Ice. After 3 winters with the UltraGrip Ice WRT's I am impressed with their tread life. I haven't kept good track of odometer readings but they look to have at least two more winters left, if not three. I put these on the CX-5 the first winter when the car was new so no direct comparisons with other tires on the same car but they do seem to be wearing more slowly than I expected relative to other winter tires on other cars. Their strong suit is on cold pavement, especially cold, very wet pavement. They are better than most all season radials in this regard.