Imac-style all in ones are one of those ideas that are downright stupid for general use.

A separate desktop (even a mini-one that can mount to the back of the monitor!) and a monitor is way better.

Instead, you get a combination that:
A) both halves die if one half does
B) will probably be obsolete way sooner than the monitor will be
C) often costs more than a comparable pair of devices
D) You can use the monitor with more than one device (typically at once, switchable from the front)

In fairness, the Surface Studio goes beyond that, because it's pen and touch enabled and has the very interesting hinge... it's real competitor is something like a Wacom Cintiq and a separate PC. Price-wise, compared to the Cintiq, it's pretty competitive in the lower configurationa although the upgrades get way spendy. And the lack of bulk to the design is really nice.

The down side is that all the other disadvantages of an all-in-one still apply, it's probably not easily upgradeable or separately repairable, and even the top-end configuration is going to be a little limited for some engineering users.

For a narrow range of professionals for whom the pen and touch combination with the form factor is really useful for this jobs, that thing looks incredible (it might get my team's UX designer off of her Mac + Cintiq combination!) but if you weren't already in the market for something like the Cintiq, you're not the market.

One advantage of the built-ins for something like this: because the CPU (etc) goes obsolete, in 4-5 years you'll be able to get one of these for light duty graphic design work for a song.