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Recently bought the XPS from Dell refurbished for about £180 cheaper than it was new so was an absolute bargain. The desktop is incredibly powerful, has an i5 processor, Nvidia GT 635 graphics card and 8gb ram.
So far for task such as gaming (crysis 2, Dead space, etc.) handles well on mid-graphics. For watching things like netflix and HD youtube videos everything is great too.
Has a HDMI, DVI and VGA port so connecting multiple monitors in high quality video isn't a problem.
The wireless card in the desktop is average, being directly upstairs from a router I can achieve an average of 2/5 bar strength.
Windows 8 that is installed on the machine runs good, being able to start from the original startup screen is a bonus (Not metro). There is also limited bloatware on the machine which is good.
The build quality is also excellent being a Dell, and the machine overall is a brilliant piece of kit.