Microsoft finally updated their Office apps (Word, Powerpoint, Excel) with inking capability. I got the a[[ updates this morning after I updated to iOS 9.2.1. Here's my initial thoughts - Pros: - It allows you to choose whether to draw with Pen only, or both Pen and Touch. By choose Pen only, you get perfect palm rejection. - You are able to edit (erase and add new annotation) to documents previously made with Windows' computer, say MS Surface. All the annotations seem entirely compatible cross-platform. - You could erase either the entire stroke or part of a stroke. Cons: - You could not turn off pressure-sensitive stroke in writing. - No quick eraser access. It requires two tab to activate eraser, and then one tap to return to pen.