If you need performance take a look at the ThinkPad X13 AMD/Intel with good 13" display and probably the best keyboard available. Linux is supported very well.

If you need performance take a look at the ThinkPad X13 AMD/Intel with good 13" display and probably the best keyboard available. Linux is supported very well. Replacement parts widely available (five years). With a docking station it is well usable stationary, too. The nice thing is, it fully usable and fits in every backpack. Drawback is - it is not fan-less and doesn't feature Coreboot. PS: X13 is cheaper than X1, maybe more sturdy and you can get one USB/Thunderbolt port extra.