I picked up a 10.5 over the weekend with the pen, and for a while I was seriously considering returning it. The only tablet I've ever had before this is a Surface 2, and in comparison the iPad felt incredibly unwieldy - I'm used to the kickstand so having to hold it up got old super quickly, and I'd always be running to my computer because I'd need a keyboard for some reason or another. But purchasing the Smart Keyboard seriously changed everything. I've given it a lot of shit in the past for looking stupid, but having actually tried it in person it's really clever in how it's able to prop up the iPad in multiple positions. The way it magnetically locks together means it's surprisingly stable on my lap too, possibly more so than the Surface was. And it's light, combined I think they're only slightly heavier than the Surface tablet alone.
I reckon it's still too restrictive in many ways, but with Apple opening things up a little in iOS 11 that's more on the app developers now. Though there are still some problems in the native apps, eg, I wasn't able to save a video someone sent me (Google Drive link) and import it into iMovie - little stuff like that. And apps are a little bit too basic for my liking, I really wish there were things like Image Composite Editor (free panorama stitcher) and XnView/Irfanview etc. The iPad Pro is clearly super powerful, and the pen makes accurate manipulation possible, but it's a shame there's not much to take advantage of that.
Otherwise it's super fast, the pen is awesome, the screen is amazing, battery life is incredible, and most importantly it feels stable. That's the real kicker here, I like Windows and would love a newer Surface but there's so much shit that crops up in comparison.
Apple has a 14 day return policy and I've had it for less than a week, so we'll see - I'm gonna take it away with me over the weekend to try it out. But I think it could be a keeper.