After reading rave reviews online, I decided to try these. While a bit expensive, they are definitely very comfortable, even for walking for an extended period. Plus, they are simple and cute!
I didn't really feel any sort of burn in my legs, but previously to getting the FitFlop I had used the Curves brand sandal, so perhaps I was already used to walking on the slight sloped heel. Also, I wore these everyday and thus far no noticeable sign of wear on the strap.
Overall, I recommend the FitFlop for its comfort, style, and durability.