I would love to get one, but I think it is too expensive considering the devices I already have.
Right now I have a Notebook (i7 2nd or 3rd gen, 8GB Ram, Intel HD 4000/nvidia GT 650M, 500GB HDD, about 1.5 years old now) and a Surface RT.
I bought the Surface RT recently (second hand on ebay), not sure whether I love it or hate it
Combining my two devices into one, sounds very comfortable!
And not beeing much of a PC gamer, the Surface Pro 3 would probably do even better than my current Notebook, thanks to the SSD... at least for everyday tasks like file management, web-browsing and office.
In many ways, the Surface Pro 3 sounds like the perfect device for my personal usage... but in my country preorders for the i7/512GB variant are about ~2450.- $ or ~1950.- $ for the 256GB version.
To replace my Notebook I would have to add a 160.- $ Type Cover too and maybe get a cheap USB hub to connect more than one device at a time.
Definitly not worth it for me, my current Notebook is just as powerfull.
A slimmed down, touch enabled version of the same thing I already have is not worth ~2500.- $.
I think I skipp a few generations and when my Notebook needs to be replaced in the future, I reconsider buying a Surface Pro (5/6 or whatever generation they will be at).
Maybe if there will ever be a damatic price drop and/or a good second hand offer, I might get a i3/i5 variant of the SP3, simply replace my Surface RT... but other than that I don't see myself buying one.