I wish I could... I was planning on the S-03s, so I read reviews on TireRack of both of them.

If you read the MX reviews, the first one (maybe not anymore, but it'll be there) is a guy with an older M3 that compared them.

From what I've gathered, the S-03 stay sticker as it gets colder, has a bit more tread life and is better in the wet. I plan on buying them next spring, ask me then