I am a mailman and walk miles everyday so I am always looking for comfortable shoes.  These shoes provide the most cushioning I have ever had in any shoe, cushioning to me is the most important thing for comfort.  The way that the bottom of the shoe curves, so as to force you to work your legs more while walking, takes a little getting used to.  Not so much walking as standing still as they make you rock backwards somewhat.  This creates a little hyperextension of the knee,  I don't find it a problem and the cushioning makes up for anything else .  Once you get used to them, you will never go back to regular shoes.  They come with a video and tell you to wear them for short periods of time at first to get used to them but, with my job, I really didn't need to do that at all and wore them the first time for 9 hours at work with no problem. I love them and highly recommend them.  They last quite a while too.