Well, my first post!
After an unbelievable amount of indecision and procrastination on my part, I finally got one yesterday. The i7/256G.
The biggest surprise is the speed. It is heaps faster than the i5/8G/256G SP2 I have, so much so I was quite stunned. I'm wondering if it is something to do with the screen as well as the SP3 screen seems much less prone to missing touch commands.
It runs pretty cool as well I've really had no complaints there at all.
I find I still like the pen on the SP2 better but as I'm really only using it for handwriting I can live with it and get used to it.
The keyboard feels better to me than the SP2, the trackpad is obviously way better and is good enough that I don't really need my Arc Mouse for the Surface.
A pretty cool device, I have to say.