Just thought I'd post another conversation I've had regarding the R300 shoes for those who might be interested... This string of comments appeared on my first update on the shoes
Shimano claims that the shoes can be molded 3 times and have stated that a second molding is sometimes a way to improve on the fit of the shoe after some use. I can say that my R300's do fit a little more closely and offer even more stability after the second molding.
I've gotten one good hard ride on my cyclocross bike in on the M300's and will publish a review once I can get a few more hours in on them. So far though, I'm quite impressed.
Thanks for reading...