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This shot of three touch screen devices shows how different they can be when it comes to form factor. The Diamond is very small and compact, the iPAQ 910 is large with an integrated QWERTY keyboard, and the iPhone is all touch with a larger display.
Here is a comparison of touch screen and non-touch screen Windows Mobile 6.1 devices with QWERTY keyboards.
The device fits well in your hand, but does feel a bit thick compared to some of the latest and greatest devices. It is very solid and has a classy look.