Over four years of lugging around one of Yamahas heaviest portable keyboards (PSR 9000) I can safely say it became a very big part of my decision to go out and play. At first you don't care because your so excited to have a new cool state of the art instrument. But later after you have to break it down, setup at your venue and then break it down and set it back up at home....it really does begin to take its toll on you. I got to where I didn't want to take it very often. Only weekend gigs or longer would push me into taking it. I didn't always have a nice concrete sidewalk or driveway to roll my board to the stage. Often it had to be packed a fairly long distance. After awhile the fifty plus pounds took its toll on my hands and my back. I would never say its the most important part of a keyboard, however it is something to really consider. After having a heavy board the Tyros 2 feels much lighter.
Just my 2 cents.

Regards,
Dennis L. Almond
aka...TwoNuts