I had the Primacy's when I bought my TL. Got the Yok's when I needed a new set. Much cheaper and IMHO just as good. I've had Yokohamas on almost all of my cars, and never had a problem with them.
The Michelin's might be a little quieter, but I think the Yok's handle a little better.
I've had both sets also. I am a pretty aggressive driver and found the primacy's a little soft, but great on the highway. I now have the yoko's and love them. I feel they are better in water and also handle better wet or dry. I have noticed slightly less understeer as well. The Yoko's aren't as quiet as the Primacy's, but aren't intruding at any speed.
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