I just put on a set of A/S 3+ on my 2010 328xi. I previously had a set of Goodyear Eagle AS which I loved, but wanted to try the MPS because of the high reviews.
The GY had almost 45,000 miles on them and still have 6/32 tread so I kept them and bought a new set of wheels for the MPS. My plan is to put the GY back on during the summer to get a few more miles out of them. I was still very happy with the GY, but didn't want to chance another winter, plus it was a good excuse to get a new set of wheels.
I have about 300 miles on them and am happy so far. Wet weather traction is outstanding, and I have tried to really push it with all the rain we have had lately.