I use CloudMagic on the iPad because I need an email client capable of saving messages to Todoist. With the update, CloudMagic gains support for any app that provides an action/share extension, and, for the most part, everything works well. From the app, I can now save message text to Clips, the native Todoist extension, Drafts, and NoteBox. There are some inconsistencies (some apps insert data received by CloudMagic in the wrong field of their extension; subject lines aren't always used to fill title fields), but it's a solid start.
The share extension is also a nice addition. You can bring it up in Safari to send a webpage over email, use it in the Photos app to attach an image to a new message, and, in general, you can rely on it as a replacement for Mail system sharing (too bad it can't save drafts).