I bought these after trying them on at the Walking Store ($250).  They were so comfortable. I had a pair of "EARTH" shoes previously and ended up with incredible pain in my arch which sent me to my primary doc for an X-ray and anti-inflammatory medication.

This shoe is different. I wore them to work the first day and was standing up much straighter. I noticed a little pain in my hip at the end of the day which I figure was due to not slouching. I then went to London and walked for miles. They were incredibly comfortable. My feet and legs never got tired and I wore them without socks - no smelly or sweaty feet at all. Very comfortable for work and my posture is so much better.

It was not hard for me to get used to these - my heel feels secure and I am not wobbly at all.