I haven't played an XLS, but i've played a bunch of lee jacksons stuff, ampeg vl, perfect connection, stealth, and modded marshalls - theyve all sounded great.
The M1000 is one of the only things i've played that I just don't "get"
It sounds like the 80s patch on a digitech rp100
I seriously only think they are famous because of that one zakk wylde advert from when he was in Ozzy