1. My opinion, but it seem unfair to dismiss the glossy screen for outdoors without actually having used it. I'm writing this on a MBA right now and I regularly use it outdoors without any problem, as do most of my coworkers.

2. If he's going to claim the battery life is better with extended battery, he needs to add it into his estimated weight as wel (which I don't believe he has.) Seems like at that point the X1 would be close to twice as heavy as the MBA, at least 1.5x.