I think parent poster had an X1 or something and assumed the conversation was about a similar contemporary device.

I'm a little sad this board isn't for my X220 ... I would be sorely tempted if it were - but like other posters I'd have some reservations about things like battery life even so.

By the (contemporary) by, a Mac Book is probably a better buy if you like Mac OS (I don't) because the hardware really is excellent. One physical point in favour of the modern Thinkpad though is weight - a MacBook Air is about 1.2 kg, whereas the X1 is not quite 1 kg.