I dont know. I never was able to get into them. I appreciate their status and they are great live acts (from the videos I saw on youtube), but overall, I never really was able to say about any of their albums "Ok, I like it enough to buy it" or even listen to one in one session, no breaks or skipping.
...they have some sick blues b-sides...such a great band. Each lp brings it's own groove. It's only rock and roll...