I have used Acrobat Reader as my annotater so far, but now that I have the iPad Pro 9.7 I discovered the iOS version was lacking in comparison with dinner of the alternatives, especially with stylus support. I bought, installed and are now happily using GoodNotes on that device. Unfortunately they don't provide an Android version, and the closest I can find, without really having used it is Xodo. So I would like to know if anyone here has tried Xodo and what you think of it. Even better if anyone has used GoodNotes and have recommendations for something similar on Android. The PDF files I'll be using still exist on Dropbox, so automatic syncing is helpful. Twitter is to communications as haiku is to literature.