I cant speak to Notions performance with iOS 9 and earlier versions, but attempting to select notes and other elements by any method - even just trying to choose the Select icon - will crash the app if youre running iOS 10. Not just occasionally - every time.
So you either need to get it right the first time on your iPad, or edit in the Windows or Mac versions of Notion. It runs in Windows 10 and Mac OS X 10.1, but all other bets are off.
Presonus is aware of the problem in iOS 10, but is uncertain about when itll be fixed. Until then, *dont buy it* if youve already updated to iOS 10.
Lurch L about Notion, v2.0.146