I really wanted to like the x260, but we equipped a team of 6 programmers with the x260 and not one was without fault. The build construction or QA must have been on the fritz with our batch because half of them would crash when even the slightest pressure was applied to the bottom left corner of the laptop. I cannot recommend it in good faith.

Pretty small screen for a development machine imo. I think you want at least 13" but personally I think 14 is the sweet spot. I say this having used an x220 a few years back.