The shoes themselves appear to be of good quality. I wear size 11 and 1/2 that was ordered. My toes rested on the front of the shoe and were very tight. They have been returned.
Pros
Very comfortable, my friend liked it, it was a gift
Cons
Limited Compatibility: Flexagon Energy TR 2.0 may not be compatible with all devices, which may limit its usefulness for some customers. The product may not work with older devices or some operating systems, which may make it unusable for some users.