I've got to jump in here. I've posted before on my search for a killer 5 string rig that small and portable, and after a bunch of trying and testing and spec research, I landed on Eden's 210XST (different from XLT) - much better low end frequency response - and an Eden 300 hybrid head.
I too play regularly through a PA with ear monitors, but our praise band has been playing some gigs out lately, (and ocassionally we find a venue to play a little rock and roll), including outdoors and some large auditoriums. With two guitars, two keyboardists, four vocalists and a drummer and often a percussionist, I've never had the rig past halfway up (using my MK5).
Each time at least one band member has suggested its really loud (ie prominent) in the sound out front and I should trim it back. At the most recent classic rock gig outdoors, a friend and long-time bassist (played with Mel Torme, Frankie Avalon) listening in the audience was blown away by the sound of that little rig and couldn't stop commenting on the clarity, bottom, and fidelity.
One of our Dallas club members has Bag End, and I really seriously considered those, (and they are great), but they didn't meet my requirement for a single small cabinet and head (My Eden is 8 ohms, so I can easily add, if I ever needed it, a 15 or 18). But with the low end response from the Eden XST line, I haven't needed it yet. If I do, it would be more for volume than frequency response.
Really liked the Bag End's, but for my requirements for high performance, easy portability, the Eden amp and 210XST cabinet has been one of the most satisfying buys I've ever made.
PS - This thread is a classic example of what a tremendous community Alembic users are - no knocks, everyone can share an opinion and is open to others' ideas, lots of terrific information. You guys are great.