I've only had my XL for a little while so maybe some day I will regret not getting the bigger model but right now I'm glad I didn't. The XL is already plenty big. I'm pretty sure it has the biggest footprint of any machine in my shop with the possible exception of my tablesaw. If it were any bigger, I'd resent the space it was taking up. The fact that I can turn it sideways against the wall to free up space is a big plus.
If it were the only machine in the shop, that would be one thing but it's just one tool of many in limited space, so it needs to be right-sized. Since I can hang work off the front and back, I can already work just as big a piece as I could with an XXL although I will have to have two jobs instead of one for the really big pieces. But how often am I going to do a job like that? That's really the question I suppose, if most of my work was going to require me to reposition my workpiece and I could avoid that with the XXL and I had the room then the XXL would be the right choice. For me though, given what I know at this moment, the XL is the right machine for me.
As for the laser, I asked about this before I bought my machine and the answer that I got was that it voids the warranty. There is a third party solution out there though. I'm hoping Carbide releases their own at some point.