I was jhust on an airplane trip and watced with some amusement my aisle-mate fumbling with a new surface pro.
When first using it on his lap, the screen kept flopping around as the kickstand slid off his legs--he eventually used the back of the seat in front of him to prop it up a bit.
Then when the tray came down, he clearly could not get a comfortable typing angle.
At some point, he dispensed with the keyboad and used it as a tablet with the kickstand on the tray, and that looked like a pretty good set up.
I asked him if he liked it near the end of the flight, and alas he said he plans to dispense with tablets all together and go back to laptops.