I find this to be a fascinating example of the Y-Combinator effect. SignNow has been doing this for six months now, on mobile and the web, with the top ranked signing iOS app. Then they launched Online Notarization, after fighting years to get it legalized and rolled out. Despite all this, they've gotten barely a mention on TechCrunch, and PG shut down their Online Notarization post. SignNow & others can absolutely be fabulously successful, but Y-combinator in my mind really makes your life easier in a lot of ways.