I have one of these too! But which one, that is the rub. As far as I can tell there are now three versions of project Sputnik. I too am so happy to throw my € in Dell's direction. I have the second because I bought mine just before the recent Haswell refresh, gah :(
Please correct me if I am wrong.
Original version ... November 2012 1: http://bartongeorge.net/2012/11/29/sputnik-has-landed-introd...
Brings 1080p (after much clamour and feedback) ... February 2013 2: http://bartongeorge.net/2013/02/18/spuntik-2-is-here-xps-13-...
Brings Haswell ... November 2013 http://bartongeorge.net/2013/11/15/introducing-sputnik-3-and...
Not sure which version the original poster is reviewing, I always meant to review mine and haven't done so yet. I upgraded from Ubuntu 12.04LTS to 13.10 and had to futz about a bit with backlight keys. Wifi drivers kept glitching out until recently. I had to add TRIM support myself (I had thought it was there, it wasn't!)
Might be an idea to set up a Sputnik User's site unless one exists :) as opposed to a Dell forum or employee's blog.
tip o' the hat ...