I had to use my warranty because of a faulty touchscreen. All is good except this refurb unit is using hardware that is pre-update meaning its still got the Intel I5 1.6mhz 4200 CPU instead of the Intel I5 1.9mhz 4300 CPU. My question is: Is the performance drop noticeable? I've got one or two apps which are already pretty taxing on the beefier version of the SP2. I admit, I'm more than bothered on the principle that I am now running around on a downgraded machine (performance aside). The only answer the store could give me is to take it in. They had no idea if there were 4300 CPU models in stock or how to find them besides opening up refurb boxes (which i'm not even sure they will let me do). I also found it strange that the serial number is higher on the refurb unit than on my original. So did Microsoft switch back to the slower CPU later on in the production run? If so, the odds would really be against being able to get a the 4300 edition.