I owned a first generation X1 for a while. Eventually sold it because it only had 4GB of RAM, and there is not much of a source of the proprietary SSD. The battery was down to 3 hours, and I wasn't going to replace it if I couldn't put at least 8GB/512GB into it.

I really liked the Lenovo X1. From 2012 to now I've went from the MacBook Pro to MacBook Air and now the MacBook Pro Retina. With the Lenovo, the touchpad wasn't quite as good, the power adapter wasn't quite as compact, the battery life wasn't quite as good (but all were good enough).

The screen and keyboard were very good. The trackpoint is a nice addition. The Mini DisplayPort worked with my 27" Apple Cinema Display without issues in both Windows and Linux (Ubuntu worked perfectly BTW). Build quality on the machine was great. Didn't run hot or anything, had all the ports that my Mac did.

Later on they sabotaged the function key row and ruined the touchpad. After a year of customer complaints they put it back, but the things were so expensive I just stuck with a Mac. If I needed a Windows/Linux machine however, they would be my first choice.