As others have mentioned: battery, build quality, Linux-ish ecosystem. If I could get all three in another laptop I would go for it, but nothing comes close at

As others have mentioned: battery, build quality, Linux-ish ecosystem. If I could get all three in another laptop I would go for it, but nothing comes close at the moment. There was a very brief moment in time where the XPS came close, and then the M series rolled out and eradicated the competition on performance + battery life.