I think the way Josh Ginter is using his iPad Pro at work is great:
I use a laptop PC at the office with an external monitor, but my desk has a keyboard tray. I don’t want my personal email flooding my work computer, and I have no way of sending iMessages on the laptop. So instead, I put the iPad Pro flat on its back on that keyboard tray and have Messages, Outlook, Slack, and Omnifocus running in Split View throughout the day. If an email comes in, I pull out the keyboard tray, print out any documents to my wireless printer, and tap a quick reply to the email before sliding the keyboard tray back in and getting back to the task at hand. If something comes through Twitter or Slack, same thing: tap a response and get back to work.
This is kind of genius.