I bought these shoes after doing a lot of research. I wanted a ligthweight, flexible shoe to use for martial arts (Krav Maga specifically). They were only going to be used indoors on a mat, but flexibility and grip were key.
I've now had them for almost a year and I LOVE THEM. They are in great condition (though I only use them a few hours a day at most, and only indoors), but they do exactly what I was hoping they'd do. They made a huge difference during a long and grueling week-long test, really prevented me getting the blisters I usually get while testing barefoot. I can't wait to try another vivobarefoot shoe for normal daywear!
I am usually between a size 8 and 8.5. I ordered a size 8.5 and it fits great. My toes have plenty of room if I'm walking, and when my foot really bends the extra room comes in handy. Super comfortable, wide enough that they don't hinder balance, great for martial arts use (but I'm sure some of the other vivobarefoot shoes would be as well).

OMG i'm actually in love with these shoes! i use them for training and lifting. The minimalist style of this company and this shoe allow for true overall mind /body and foot/ earth connection to reestablish that proper movement patterns within the foot and ankle. I will say running in the shoes was different, definitely felt it in the ankles and calves since my body is not used to that type of impact, so just know that it will take time to adjust to the shoe if you are new to the minimalist style, don't give up on them!