My Niles are currently on eBay. For some reason, the heel straps were just too big and flopped around on me (I have narrow heels).
I have three pairs of the BEACH shoes and love them. Stylewise, I like the Athens better. However, I think my Niles are too big, too. I bought an 8 (I wear an 8.5) but they seem really long and my heel doesn't hit in the right place. So they're fine for around the house and at the mall (three hours yesterday). I tried on a size 7 yesterday, and they were too narrow...
Think I'll just stick to my Beaches for the parks and the Athens for home. I'm too afraid to try them for all-day wear.