Well I just had a set of these brought in to 'America's Tire Store' in
Mtn. View, CA.  Drove on down to get the new sneakers applied to Moby, &
just as they're about to be mounted I noticed NO M+S designation!!!  If
you don't have the M+S on the tire, CHP is going to force you to put on
the chains (Syncros don't count)!!!  After a buncha calls to Michelin
ATS determined that indeed they're not M+S, so there they sit if ennyone
want's 'em (4 ea).

Nobody at the store could believe they weren't M+S - they even have
Nittos that are M+S in 40 section width!
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Yet another reason why the MXT tires are not always the best choice.
Also, the $75 per tire quoted by a previous poster is a fantasy in my
opinion. There is no mention of this tire on their web-site. In fact
they dont even have any stores in the North East US. And if you order by
mail you have to pay shipping, which negates any saving.