Yeah, getting a more flexible work environment seems like the only non-gimmicky selling point here. But there are much cheaper and lighter devices for that. Like NReal Air. (Haven't tried it but reviewers seem fairly happy)
I have gone both ways several times.
Being able to group apps and then being them to focus on the single display works fantastic!
I took the time to get seriously productive in either case. The difference was not a big deal.
Chances are the OP rocks it as hard as they can. I was able to.
And being mobile these days, being able to work on an Air is a real plus!
I will now wait for a future revision.