I must have short toe cleavage.  The location of the thong was too far back from the toe of the shoe, which resulted in my heel being too far to the back of the shoe.  Nice enough looking shoe, but they wouldn't work for me.  I can wear other thong-type shoes, so it's not a universal thing.

Also, although the sole is molded and does provide support (YAY!), the sole is somewhat spongy.  If you prefer a firm sole underfoot (as I do), consider a different style.