I have an XL and was just scrolling through the hundreds of blank IR slots, and the 700 and something presets. It's cool to have, but I just haven't been using any more than I did with the Mk1. The last few FW updates sound so good, i really don't mess around with settings too much. I've gotten used to just picking an amp and trying a few different cabs then I'm playing guitar. I'm mostly using the factory cabs now!! i have several cab paks, ownhammer, the amp factory, you know like a couple thousand ir's (!), but I haven't even loaded them into the XL yet.
So OP, whatever you get, I don't think you'll regret it. The Mk1 and Mk2 have a lot of room for presets and cabs, the XL just has much more room. I got the XL to see if the new instrument input made a difference, and I couldn't tell the difference from a Mk1. If the idea of the XL is bugging you, like it was me, then get it. Just don't tell your wife! :lol