A place I work used to order them for developers, they're awesome little machines but not without their issues too. We had constant issue with them no longer charging for people, something on the motherboard related to charging would just die sometimes machines only a few weeks old would do this. You'd start your day, try to start up your laptop and it would be dead and require sending back to Lenovo (which to their credit they would fix and return within a reasonable time frame.)
In the company I currently work, we have the option of MacBook Pro's or ThinkPad X1 Carbon. I never seen such a problem. I am not saying that it does not exist.