MGZ - tell your dealer they need to have a set on hand before they speak.
They are wider than most for the same size. I know this first hand coming from Bridgestones SO3's which were wide and tall compared to a lot of tires in the same size.
I had the Bridgestone RE960's and the F452 is wider by 12mm in the same size 245 and the 275's were about 5mm wider.
I switched to these on my M3 and M5 and I like them a lot. They handle very well. The response is much quicker than the Toyo T1S which I had as well. I returned them for the Falkens 452's. The reviews are very good for the tires. I was not a fan of the 451(Junk) but the 452's are far superior overall.
You won't be disappointed. The PS2's is a great tire no question but will you push it to the limits everytime in order to get the money out of them? That is why I went with the Falkens. The Michelins are not double the performance. Maybe 10% better. Many of us can afford the Michelins and some do and some don't. I don't drive my car enough to worry about replacing my tires that often so it wouldn't hurt me to get Michelins but I still didn't.