I grabbed a bunch of free IRs from all over the place a few years ago, and man it was tedious to audition them, even in a DAW with an existing recorded track. I ended up deciding while they all provided different options for sure, I couldn't say it was worth having that set up for my general daily use. Maybe it is easier with the EPSI or Torpedo, dunno. I guess if you find a special cab model that really works for what you are doing, it is the way to go.

And Narsh, I would tend to agree - your stuff sounds top notch already!