I used Dell XPS 13 Late 2013 model (with Ubuntu installed), and now I'm using rMBP13. Main difference for me was noise: I was surprised how silent macbook pro i

I used Dell XPS 13 Late 2013 model (with Ubuntu installed), and now I'm using rMBP13. Main difference for me was noise: I was surprised how silent macbook pro is compared to Dell XPS . For XPS it was enough to run something even slightly more CPU hungry even for couple of seconds and you already hear quite loud CPU fan noise. I got used to it, but when moved to rMBP13, I was pleasantly surprised how silent this machine is, even considering that CPU was way more powerful on rMBP laptop. so I highly recommend checking CPU fan on new Dell XPS 13, just to make sure you will not be annoyed by loud fans.