I'm interested in this question too. I set my girlfriend up with the Surface Pro 3, and besides it being awkward on her lap (ironically, the Surface needs a surface), I think its an amazing machine, especially for the price. It isn't quite Apple level with the hardware design, but it's close and it feels like Windows 8 was designed for it.
My worry is that Ubuntu wouldn't really work with the touch screen.
Edit: I should mention, she got the i5 1.9 GHz and mostly uses it for work (Excel / Outlook) and video (Skype / Netflix). No fan issues.
Eh, I figured the money was worth it since she wanted to do HDMI to a pretty decent projector. Plus, her last laptop lasted her 5 years and I figured a Surface Pro would too.
My worry is that Ubuntu wouldn't really work with the touch screen.
Edit: I should mention, she got the i5 1.9 GHz and mostly uses it for work (Excel / Outlook) and video (Skype / Netflix). No fan issues.