Note this run Windows RT not the full version of Windows.
Windows RT is basically the "metro" front end of Windows 8 but without the full function Windows underneath.
So it can only run "apps" downloaded from the Windows Store and not "proper" Windows programs.
The Surface 2 has sold very badly and Microsoft keep having to reduce the price to get rid of old stock.
There is also a question mark about the whole future of Windows RT and Microsoft may kill it off so you could be buying a "dead end".
Not it is the Surface Pro devices that run the full function Windows.
Bit about its future here
http://techcrunch.com/2014/09/15/the-surface-2-slow-fade/