+1 on XLTs playing better with others. I had an XST when they first came out. Sounded great - really nothing wrong, but couldn't blend it with other cabs (15's and another 210) to save my life. Since I wasn't interested in investing in a second XST, I sold it. On the other hand, in my experience, XLTs have a little less bass and sweeter, punchy mids. They mix and match freely with other cabs. Both XLT and XST are nice cabs, though.