I heard them today for the first time on Sons of Anarchy with "Can't Make It Through the Night". I fell in love instantly. I felt I was listening to Good, OLD, 1968 Rolling Stones, but with a fresh guitar and energy that wasn't there on the crackly albums! I am in LOVE.
One word: Phenomenal. Absolutely the best rock and roll that I've heard in the last ten years or so (and there are quite a few good ones around, if you haven't noticed). Start with a sound anchored in Beggar's Banquet through Exile on Main Street era Rolling Stones and build it from there with classic Americana.