I took my Xootr to Italy and if you follow the directions on the Xootr site it's pretty easy to pack. The only thing I'd add is that if you have the Xootr model, on which the paint is pretty liable to scratching so wrap each tube in bubble wrap or cardboard. I didn't do this and my bike has the scratches to show for it. Also, even with a 32" suitcase the fit is a bit snug, which puts some stress on the frame, so I'd highly recommend getting an exterior compression strap just to make sure the suitcase doesn't pop open when (not if) it's dropped by a baggage handler.

Jonathan