After encountering some bugs in the X10, we contacted Sony Ericsson. The company said that the review unit we had received was running preproduction software that will be updated before the X10 goes on sale. We'll update the review and give the X10 a rating once we get a unit equipped the final version of the operating system. By now, most Android fans have seen the videos of the Sony Ericsson Xperia X10 and its silky user interface. Likewise its exciting specs (which include a 4-inch display, a Snapdragon processor, and an 8.1-megapixel camera) are widely known. But does it live up to the resulting high expectations? After spending some time with the Xperia X10, I have mixed feelings. Though I loved the phone's hardware, the software was buggy and slow at times. And faced with shortcomings such as the absence of multitouch and the omission of an Android 2.0 (Éclair) upgrade, I can't recommend the X10 over other high-end Android phones, like the Motorola Droid and the Google Nexus One.for further: www.businessweek.com/idg/2010-03-31/sony-ericsson-xperia-x10.html
