These guys are hit or miss for me. Some of their stuff has that loose, raw sound that I like in my folk/bluegrass/country (? did I just say I liked country? because honestly, I don't.) but a few of their albums are too slick or overproduced to make me happy.
I like the rough edges on folklore and low estate but sackcloth n ashes and secret south are just too clean for my taste. If you're gonna fiddle, make it scary how rough it is.