I would think that the point is that it's virtually losing no battery time while in sleep mode. So, if you have 5 hours of battery life fully charged when you l

I would think that the point is that it's virtually losing no battery time while in sleep mode. So, if you have 5 hours of battery life fully charged when you leave the house, that really means 5 hours of the computer on, even if you use it 2 hours in the morning, let it sleep the whole day, and use it 3 hours at night. I also never turn my MacBook off, and can use it during my commute both ways without having to charge it at work. But I'm pretty sure that tonight it will have visibly less capacity than when I finished this morning. Sometimes, it also dies while sleeping. It sound that it wouldn't happen as much with the Air. Overall, I already feel that my MacBook is instant-on; this is icing on the cake.