If you are interested in this new Dell XPS 15, this is a much better review [1]:

http://www.notebookcheck.net/Dell-XPS-15-9550-i7-512GB-UHD-I...

NotebookCheck folks do some of the most thorough testing of notebooks you can find anywhere.

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[1] For example: ArsTechnica review seem to have botched graphics tests somehow.

Having Nvidia GTX 960M GPU is a big part of XPS 15 value proposition (and what makes it stand out from e.g. Macbook Pro).

This doesn't show up in ArsTechnica review, yet it is completely obvious in NotebookCheck one.