I like being able to edit my presets and midi funtions, even guitar tunnings via my laptop. I keep my laptop on stage with me just in case I want to tweak on something during a rehersal, and I can completly change a sound within minutes and store it. This is escpecially helpful when you use your XT live with a midi capable amp. Line 6 rocks.
Do you think they will ever just make replacement upgrade cards for the variax guitar when they come up with new sounds? You could just pull out your old card, and slap in a new one that gives you a completely diffrent variety of options.