Mine has gone back after two days, too hard to use for me, took over and hour to set a ring tone, alarm and get sound from it, I couldn't use the touch screen very well, so it was a two handed job all the time, couldn't get my text to work, blue tooth didn't seem to work.
It does seem a cool phone but for me it is just to complex to achieve very simple tasks, therefore I do not recommend the Sony Ericsson Xperia X1.

However in my experience Sony Ericsson Xperia X1 is very very slow! When you text using the SMS feature it tends to crash now and then in my experience. Apart from that good realible phone, however I have sent it back to Vodafone already in less than a week, not as good as made out to be. Therefore I dont fully recommend the ony Ericsson Xperia X1.