The XPS 15 sees Dell bring its evolutionary InfinityEdge display to a 15-inch laptop for the first time. If you're a fan of the XPS 13's space-saving design, but enjoy the productivity gains of a 15-inch laptop, Dell's latest machine promises workstation-class performance in a similarly compact chassis boasting the footprint of a 14-inch laptop.As a former 11-inch MacBook Air owner, I was a fan of last year's revamped XPS 13. It looked the part, had the chops to cope with any task I threw at it and fit snugly into my backpack. The XPS 15 sacrifices some of that portability in exchange for a roomy 4K display and a dedicated GPU. This makes the Dell XPS 15 a good, but not great, choice for 1080p gaming ? but more on that later.Design for lifeThe new XPS 15 bears little resemblance to its early 2015 predecessor, which itself was upgraded with a 4K display. The latest model's corners are much squarer, lending it a more box-like shape, and any silver flourishes on the inside have been swallowed up by a sea of matte black material. Dell's latest XPS 15 is essentially a larger XPS 13 design-wise, from the black Dell logo etched into its silver aluminium lid to the thatched pattern on its black base. The laptop's minimalist look is the opposite of what you'll find on flashy gaming laptops. If you prefer the quietly subdued, no-nonsense look, then you'll enjoy what the XPS 15 has to offer.I find the tactile, rubberized material around the trackpad much more welcoming than the 15-inch Retina MacBook Pro's all-aluminium base, though the XPS 15 gets dirtier much easier.