I have a set on my '11 35i purchased 5/14, and I have had zero issues in 16,000 miles.
rotated twice now and check tire pressures monthly. wear is very good and wet traction in the Florida rain is also very good. I do not have snow or ice conditions so no data.
I read the 35i x3 reviews on tirerack and found them more warm and fuzzy than not.
http://www.tirerack.com/survey/Surve...irePageLocQty=