Interested, but I'll pass
At first glance yesterday I thought they can jog right on at that price with those spec's, but actually after watching the press briefing video today I'm far more interested in it. Can see the value proposition for those who commute via public transport to be fully productive without having to get a laptop out (which is never practical). The money clearly goes on the screens which whilst isn't as cool as the actual single folding screens from Huawei and Samsung seems to have a lot of engineering in it and does appear to be genuinely well thought through, well optimised and very productive.
But this is MS we're talking about, which means no way will I try a 1st generation product. (Ex-Windows Phone, Band and Groove user here!)
If this is still going strong in 3 years time, I'd be very tempted by a 3rd generation version of it. As long as they have the stamina that is.