I bought mine a year ago at a friend's recommendation and they're still going strong, even with wearing them all day, most every day.  I live in a climate where you can wear flip flops all year long.  They're just as comfortable as the day I bought them.  Although they do soak up water and get squishy and a little slippery, they dry out quickly.  They provide excellent support and don't make your feet tired.  And the best thing I've found? They DON'T STINK!!!  And they don't make your feet stink, either! I LOVE them and would highly recommend them.