What's the keyboard on the X270 like?

Personally I like the X200, X220, X230, ... series (as well as T400, T430, ...). One of the primary deciding factors is the quality of the keyboard.

P.S. What's it like to run 9front on a laptop? Is this a practical machine for getting the job done, or do you just want to learn about OS'es and experience the joy of Plan9? (I wanted to run Plan9 in the 1990's but was not yet open source at the time; plus computers were still expensive and finding a spare, compatible computer for a what would essentially be a hobby machine was out of the question.)