Well I bought these and the Reef Men's Fanning Thong Sandal and I had a hard time choosing between the two. Wore them both for about an hour and maybe the air pocket on the heal was a touch more cushy. But I was looking for something to wear on a boat and these just seem to be a bit more performance orientated. the soles seem to offer a little more grip.

I'm not sure about the adjustable arch yet, but the arch support is very good. I'm having trouble telling the difference when i adjust them. seems like its a good 20 turns to go from min to max. I certainly can feel the adjustment working with my fingers but not certain what is most comfortable.

Overall great buy. Glad I spent the extra to get the performance series, feels like I could run a couple miles in these.

Just a quick update ; It's  been over a year, 8/3/14
I wear them all the time. Work 8 hour shifts on my feet in them. They are just starting to show some wear and tear and thoughts of replacement. The materiel in toe strap just kind of separated and the White padding material fell out. and top half of strap.  The soles have plenty of life in them.

Think I will buying the same thing again.