I've given onenote a try on the yoga and it works pretty well, even using a finger for freehand notes. the touch screen is fast enough to keep up with any writing. I imagine one of those capacitive 'touch' pens you can get for under $15 would make it a lot easier too.
I was very taken with the hp envy spectre but the day windows 8 was released I saw the yoga with its high res IPS screen and I couldn't resist. It's a very versatile machine and the whole concept works better than I thought it would. faults if any are lack of back lit keyboard & it's too big for comfortable tablet work resting on the crook of your arm.
I thought about waiting for some of the more tablet-centric models to appear but it seems screen resolution loses out on those machines.