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HP Spectre touchpad/trackpad
Both also had uniformly terrible touchpads, with the Envy 14 (above) edging out the DM4 in the terribleness stakes by having virtually unusable multitouch gesture controls.
Overall, the performance of the two machines I tested was broadly comparable, particularly for the everyday tasks that most people walk into a computer shop and ask about. When it comes to looks, even the difference in thickness and weight that the ultrabooks are marketed on wasn't that much to write home about.
There is one major point of differentiation between them, though: the DM4 Beats Audio Edition has a retail price of around £700 while the Envy Spectre costs £1,200.
For such a price gap, I really had expected much, much more disparity between the two.
Image credit: Ben Woods