I was going to wait till I had them awhile before reviewing but I really, really like these shoes.
I usually wear a size 8 but have wide feet and a very high instep so went with the 39EU/8-8.5 M US. They are a perfect fit with some room in the toes. I can wear them with or without socks and they are very comfortable.
Have not used them on the trails yet but have used them riding my bike, exercising and walk/running. (They are so cute I must admit I have also worn them to the movies and the grocery!)
So far they have great grip, are super light, nice looking and protect my feet while still giving a close to barefoot feel. VERY happy with this purchase!