A year and a half ago, when I purchased my Thinkpad Yoga (similar to a Surface) with Windows 8.1, I asked about ways to mark up / annotate PDF documents using the pen / stylus that came with it. Acrobat XI unfortunately does not pick up the stylus very well. FoxIt doesn't do so well either. Windows PDF Reader does a decent job, but only pen color is blank, not red. Many people talk about OneNote, but when I import PDFs into OneNote, they come in very distorted.
For Office documents, Office 2013 pen features work great. But for PDFs, I'm still searching for a way to annotate PDFs using the pen. Can anyone provide any new suggestions?