While I would like another week of driving before I really make a judgment, I discovered two things in the last day. First is this review of the HTRZ3s
http://www.rightfootdown.com/?p=83
The author complains of soft sidewalls and poor braking ability. After reading this review, I will probably go back to the Michelins simply to compare again. To me, saving several hundred dollars is not worth the performance sacrifice.
The second is that as I was driving yesterday evening, crossing about the 400 mile mark on these tires, they did appear to be gaining traction left and right. I'll need several days of driving to discount other variables like change in weather, change of roads, my imagination, etc ...
but they did feel like they were improving, hopefully breaking-in.