Like others said, these shoes do take a little bit of a getting used to period.  Mostly because of the plastic part that rides between your toes.  That being said, my break in period was short,less than a week, and never resulted in any blisters to speak of!

Now they are the most comfortable shoes I own! Also, I am 9 months pregnant, and they are a breeze to put on and take off, and unlike other flip-flop type shoes, they stay put on my feet! Awesome shoes!