This is absolute precision. Love my Birkie?s IMPORTANT - you have to understand why there are two wrenches (which are not sufficient for some of the steps - I had to use my vice grips). I guess I will just wear 2 socks on my right foot! My almost 2 year old daughter doesn?t wear these much, but when she does, the look super cute. Ive had to share the link with friends; everyone loves it. They initially worked a couple of times. Like someone is watching television near you then you may not listen to the music but vocals you will. But DO NOT waste your money on these. Ive always had good luck with Vionic shoes and its nice to see that their slippers live up to the same quality.