I ran about 350 miles in my Glycerin 9 running shoes and was very happy with them.  When I went to replace them in July 2012, I found them out of stock at my local running shoe store and was directed to the newer Glycerin 10 model.  During my store fitting, I didn't notice the toe box was smaller in the Glycerin 10 than the Glycerin 9 model. I bought the Glycerin 10 and began running in them immediately after.

After about 20 miles (one week) I noticed that my small toes were getting blisters. I switched to thinner socks but the problem remains: the toe box in the Glycerin 10 is shaped more like most other available running shoes today. It is tapered to a point instead of rounded like the Glycerin 9. The point in the Glycerin 10 is slightly closer to the large toe, but still prominent, and this shape causes my small toes to become pinched during running.

My original pair of Glycerin 9 continues to remain comfortable even at close to 500 miles, but have begun to lose their cushioning. Now that I've found them here on Amazon.com, I am buying another pair of the older model Glycerin 9. I'll put my Glycerin 10 aside for now, and hope I can find a way to stretch the toe box so I will not have wasted my money. I am not confident that I will be able to do that.