Sony Ericsson Xperia X1 contains many features previously unseen in Sony Ericsson mobiles. Their earlier products in the smartphone segment have featured limited new ideas and have been tainted by the slow, somewhat illogical UIQ interface.
In contrast, the Sony Ericsson Xperia X1 contains everything but the kitchen sink and uses Windows Mobile 6.1. This gives it a lot of advantages compared to its predecessors, but also highlights some less impressive aspects. It also lacks a bit of the Sony Ericsson "feel" in several ways.
A fun feature of the Sony Ericsson Xperia X1 is the navigation cross, with a central button that doubles as a touchpad. It's not entirely to our liking since a mouse pointer is nowhere to be found on-screen, a feature better implemented in, for instance, the Samsung I780 earlier this year.
Apart from that the Sony Ericsson Xperia X1's keyboard is good, with slightly raised separate keys sitting a millimeter apart. It's rather comfortable to write on, but, again, not as comfortable as the HTC Touch Pro's equivalent.
The Sony Ericsson Xperia X1 has a little more RAM and the display is 800x480 as opposed to the straight-laced VGA resolution in the Touch Pro. This gives the screen, and consequently the entire X1, a slightly longer and more narrow shell, which also explain the lack of dedicated number keys on the keyboard.
The X-Panel consists of a number of different start screens shown either as a grid or as a fan. The only screen you cannot replace with any of the built-in (or downloadable) alternate designs is the main Today screen that acts as Windows Mobile's foundation. Applications include a media file drawer we've seen in other Sony Ericsson models, a calendar screen, radio, Google search and so on.