I bought winter tires for my M35X this winter. Here is the original thread:
zerothread?id=384624
After driving with these all winter, I have found them more than acceptable. I have had no problems going wherever I want, whenever I want, in the Iowa winter...as long as the snow depth doesn't significantly exceed the clearance under the car. Note that I went with 17" winter tires/wheels so I could get some smaller tires and save some money. The TPMS sensors work like a charm, no issues all winter long.