I have a 128Gb SP2 that I use as a tablet mostly, with Metro IE, Next Issue, Kindle and light Office stuff. A lot of times I use it in bed next to my wife, and it is quiet - the fans never come on, unless I fire up Civ V. I want to upgrade to the SP3, but I've read so many negative reviews as far as noise/heat that I'm a bit skeptical. I know that firmware updates have improved it somewhat, but I wanted to ask those of you that have upgraded from SP2 to SP3: 1. How much different is it? Is the fan on more often? How does the sound compare? 2. Is there really a difference in i5 vs i7 as far as fan/heat issues? Thanks for any feedback.