Interesting to hear from guys who go "all the way" with the modeling stuff. I am not there at this point - my tube amp is just too much fun. But then again, if I tried the Pod XTL through an Atomic amp, maybe I'd change my mind, I don't know.
I just like pedals through a tube amp. Yes, it means a bit of tap dancing but I can get some unique and wicked, to me, sounds out of such a combination.
However, for a guy who gigs a lot with different kind of bands and different musical styles, I can see this modeling scenario being the ideal situation.