doing a comparison is problematic in that the cab IR's are night and day different, so depending on which one you hear first your conclusions will vary. if i start of with a nice warm scumback tone with in the room sound then go to ANY cab/mic combo in the eleven rack then you will hear the eleven rack sound like harsh nasty unusable crap, when in fact stock cabs can be eq'd to be usable.
Could not agree more! For me the biggest plus of the EPSi is that it takes out all that fiddling with the EQ/speaker breakup, etc to get a usable tone. I am now using my 11 Rack more like a regular amp/effects set up now. i.e. pick your amp and tune effects to suit and you are good to go!
OK, maybe over simplifying the process, as you can spend a fair bit of time finding the right IR. But the more I explore Ownhammer IR's the more I am narrowing my choices.....