I'm currently using a Line 6 Floor POD Plus, but I'm not thrilled with it. Not being able to "see" the parameters for my amp and stomp box models makes it very difficult to tweak on-the-fly. Plus, the realism of the models is, well, not very real. I've heard good things about the newer Line 6 POD's, such as the XT Live, X3 Live and HD series. What are the differences between the XTL and X3L? Are the HD's any better? Are the limitations of the HD300 (that is, not being able to use Compressor and OD/Distortion at the same time, having to stomp two pedals to move up/down for channel select, and the quirky Smart Effects "Swoosh" knobs) a hindrance?