PC Advisor have published a review of the new Sony Ericsson Xperia X1 smartphone. 'The outside of the Sony Ericsson Xperia X1 features an eye-catcher we have requested for a long time from Sony Ericsson with regards to its Walkman music phones; a 3.5mm plug for earphones. This is a first for Sony Ericsson and, as far as we've seen before, unique for any Windows Mobile-based phone. Kudos. Most of the phone is solidly built with a metal shell, but the front button are made of almost ridiculously unstable plastic, which taints our first impressions. 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.'