I have two pair of these and they have lasted me the longest of any other water shoe.  They are really cute as well; I get compliments at the gym all the time.  I have the blue and pink pairs to match my two favorite suits.  I run in the water at the local gym, and these give me the traction I need. I have worn the soles down on these two pairs a lot in the last 8 months, and am buying another two pairs for when they finally fail.  Other water shoes have worn through in as little as 2 weeks!
I find that the toe box on these shoes is not as stiff on top as some other shoes which means my big toes aren't jamed forward or upward as they are in other, stiffer shoes.  I remove the inner sole as it doesn't last long, but it's really not needed.