How does somebody manage to make a convertible pliable, with thick bezels, narrow gamut, small battery and squishy keys, yet heavy and so expensive?
I checked out their site and about half the page was dedicated to the stand design, and indeed it has the benefits of keeping the screen erect without a separate stand which would be unwieldy to use on the lap, and that the keyboard would stay active even detached unlike any Surface keyboard(in the latter case you need a separate stand for the tablet).
Also there's a battery in the keyboard that should allow 7 more hours screen time. 23.4Wh does sound too small to be true and it is, if you only found 23.4Wh then the keyboard battery may need manual activation (?) or there was some glitch in your unit preventing the tablet from accessing the keyboard's battery.
Another selling point is the selection of ports which despite the abysmal SD performance is still far above average for this class. The Surface Pro's barebones port selection is one of my main complaints for it. The Wacom interface included is sure to be more expensive to implement than N-trig, but I doubt the benefits given this screen performance. The PM981 also reasonably inflates the price as VAIO seems to think the fastest SSD is crucial for user experience.
The tablet alone also weighs "603-622g" leaving the whole package at "1.209-1.223kg" according to the manufacturer and I would guess that you somehow got the wrong numbers. It's not very light but it's average for this class. They couldn't lie about this, not at this scale.
Still I don't see this selling to anybody other than some corporate users with some very specific needs and too much cash burning holes in their pockets. The overall design is old-school and may appeal better to Japanese users like the Panasonic Toughbooks though.
It'll probably be on clearance for 50% off in a few months time. It's certainly worth that much, IMO.