I have an iPad Pro 12.9 and it has worked out as a great productivity tool......ish.
Interested in the poster who saw someone using one of these on the train...aside from the worries about breaking an expensive piece of kit, I'm surprised they bothered...the battery on mine discharges so quickly with the keyboard attached and a couple of apps running that its hardly worthwhile taking it out of its case.
Apple are so cheapskate that the charger supplied cannot even keep up with the power being drawn from the unit when under charge but with a keyboard attached.
You can of course invest in an additional 29W power supply and USB-C charging cable for another £80.
Style over substance. Wont be investing in another, it's Surface Pro for me next time around.