I don't understand the WHOLE 1.5lb complaining.. Since when are men(and ladies) such wimps. If you want a strong machine, be a bit stronger yourself.
My last year of college was spent carrying a 2010 Air around with me instead of the PowerBook and it was a signficiant difference in weight.
You just have to realize that a laptop isn't the only thing people carry around. So 4.6lbs isn't a big deal, but when you add it all up then the number starts to increase. Extra savings is beneficial.
Or try taking pictures/movie on the device for extended periods.
1.5 lbs is a lot for one arm to keep held in place all the time. The tablet form factor makes it inviting, but the weight makes you feel it.