I've been wearing Shammas for 7+ years. I prefer the Warriors because the soles are so thin, but I usually buy Cruzers which are a little thicker and last about 50% longer (I walk ~4 miles everyday). I also get my Shammas custom made (they do this for free) because my toes are longer than average.

There's a bunch of companies making this kind of sandal now. Earth Runners are probably one of the more popular brands. They ground you with metal thread and a copper plug - which is supposed to be more like walking barefoot from an electrical charge perspective.