The Desire Z seems a bit of an oddball. It's a big touchscreen phone, along the same lines as the Desire, but it also includes a keyboard that emerges from underneath and an optical touchpad for general navigation.That hybridisation means it's a bulky device: it's thick, measuring 14.2mm and, at 180g, pretty heavy too. Neither are we completely convinced about the mechanism through which the keyboard appears. Instead of sliding smoothly, it pivots on a double hinge out and over. It feels a touch on the flimsy side.
The keyboard itself, however, is beyond reproach: if you don't get on with touchscreen text entry, this is the phone for you. The keys of its physical, Qwerty keyboard are large, well-spaced and responsive.
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http://www.pcpro.co.uk/reviews/smartphones/363946/htc-desire-z