So, I've taken my B2R's over 100 cumulative miles now and I do love these shoes. My runs in them have been constrained to under 7 miles at a time. Although I'm beginning to slowly up the miles and have done two 10 mile runs and I've had no issues. I'm building up to my annual Thanksgiving Day 40 miler in FLA, which I plan to run in my B2R's this year. The shoe upper look new, showing no wear. The only noticeable wear is on the fore foot tread, smack dap behind the toe split across the seam, which I believe is a good/normal wear location.
I've run in all the possible combinations (socks / no socks, B2R insert / no insert, taped toes / no tape). I've settled on socks with the B2R inserts and taped second toe right foot (I've had issue with this toe since birth...not a big deal).
The construction of the upper is excellent. The shoes are great without socks, but I'm playing it conservative (my heels are a little susceptible to blistering).
Removing the inserts increases feel and I lean toward removing them, but I've recently read Natural Running by Abshire/Metzler and they discuss assessing your foot mechanics looking at wear on shoe tread as well as the insert. So, I'm giving that a try with my B2R's. Regardless, the feel of these shoes is great.
I have come to really appreciate the split toe. It's hard to describe the feeling, but I believe there is something beneficial just prior to toe lift off. Maybe it enhances lateral flexibility across the toes allowing them to splay. I don't know. All I know is that it feels good compared to standard shoes.
These are truly awesome running shoes. More to come at 200 miles...