I've had my 11" 2011 MBA with 2GB ram and 64GB SSD for a little while and love this little computer, but have really been wanting to upgrade. Saw a refurb 2013 11" base model on the Apple Store yesterday and couldn't resist. Can't beat the refurb price from Apple and after selling my 2011 I ended up with a pretty sweet deal. I'm looking forward to doubling my ram, SSD and battery life compared to the 2011 and the wireless AC capability. Would going with a 2014 or 2015 have been a massive improvement over this one?