I ran the blades on the EU Fiesta for a full year without any problems. I had to replace the fronts on my 2011 after the first winter since I got a rip in one of them after it froze to the glass. The new set has gone through 3 winters. The replacement set on my 2011 are Motorcraft ones. The ST blades went thru 3 weeks of snow before it was returned and did not have any issues. The car stayed outside and did not get a chance to come into the garage to thaw out like my 2011 does.