Well as I'm about to start a roll20 game of DW (The Sleeping Gods) I went ahead and bought the PG.
I must say between the additional skills and combat stances, (and new Professions!!) it's a pretty damn cool addition to the line. Some of the new equipment and weapons are great as well!
We start tonight, and one of my players has created a bunch of macros which allow me to pretty much make all kinds of rolls (automated surprise checks, automated spell expiry rolls, eavsion rolls, you name it) with the click of a button! Having people with these these skills in your group, especially in the online format, is a godsend. I just wish someone had made a character sheet for it, as we've had to cobble together ours from the basic Attributes & Abilities sheet.