These are about my tenth pair.  The knobbies take some getting used to but I got used to them long ago.  They are the perfect slip-on for casual use, with or without socks.  And when they get old and stinky, you can take them kayaking.  I've had pairs in the past that gradually lose the little knobs and they end up in the corners of your living room but that's usually an indicator that they're due for replacement.  Worth the $30.  I dig the new colors they've come out with too...gone are the days of simply black and white.  There are cheaper ones out there but the Adidas will last longer.