Agree 100%. The only catch is that the pen tracking can go a little wonky near the edges. There is, however, a fix: http://forum.xda-developers.com/showthread.php?t=2171198
If you don't need handwriting recognition (I don't personally, but it is nice to have), I've found that Stylus Labs Write to be better than the App Store's version of OneNote (http://www.styluslabs.com/). It seems to have a little less lag than OneNote for note taking also. FWIW, Write is cross platform, and I imagine it would work great on something like a Galaxy Note.
The full version of OneNote, however, is worth the cost of admission. Works fantastic with the Stylus and is way better than the Win8 App store version.
Landscape vs Portrait will also cause issues, because the angle of the pen is different, and causes tracking issues. It's imperfect, but I still love how good the pen is on the Surface compared to all the tablets that don't have a Wacom digitizer.
I've got an ipad, which I love for a lot of things, but even with the various pens/stylii, the writing experience is pretty bad, for me.
I also plan on keeping the iPad around. lstamour mentioned this in another post, but weight-wise, I'm assuming I'll still prefer it for reading pdf's and such. That's actually the main reason I got an iPad to begin with. I wanted to be able to read tech books, pdf's, papers, etc on something electronic and iPad beat everything else I tried.