I've held out getting an iPad for years now. I love my 15-inch Macbook Pro, can't imagine being more productive on an iPad. I listened to CGP Grey describe his setup and how the iPad Pro was like the best piece of hardware he's ever owned.
Well, the iPad will be in addition to a laptop that I'll need for GIS and working together with others, so it'll definitely not be my only device for productivity. I did realize that on my 13"MBP, I did not do much more than text editing and browsing, so it's not a loss in my mind. I'm pretty sure it was this Cortex episode that got me interested in using an iPad. I already use pen & paper as a way to get my thoughts straight but want to up my ante. Playing around with GoodNotes and Concepts already has me confident that I've made a good decision.
I had a couple ipads. They're fun to play with it you don't need a keyboard for something and just want to sit around without a laptop in your lap. I can't imagine being productive with one but I suppose it's doable with a Bluetooth keyboard. Without that it's a giant phone. I'm curious about the pencil but I'm a traditional media dinosaur so I don't even see myself ever bothering to even play with one for art. YMMV