The difference in weight is much more than it sounds. Work had issued me a Lenovo Thinkpad T61p with a large extended battery pack to make it last closer to 4

The difference in weight is much more than it sounds. Work had issued me a Lenovo Thinkpad T61p with a large extended battery pack to make it last closer to 4 hours. It weighed about 7.5 pounds. After just 15 minutes, my shoulder would become sore from lugging my bag around. I handed them their laptop back and bought a 15" MacBook Pro with my own money. Just that 2 pound difference means that instead of my shoulder being sore after 15 minutes, it takes about an hour for it to become sore. If I didn't need the memory and the CPU (I do data warehousing work, and need to run VMs almost all the time) I would certainly have gotten a 13" MacBook Air to shave off another 2.5 pounds. Heck, I'd probably get an even smaller bag just to shave off another 1/2 a pound. It's absolutely worth doing.