The Xperia X1 is kind of a mixed bag. For every good thing the phone does, there seems to be something detracting from it as well. From a hardware standpoint, this is a well built phone that feels extremely solid in the hand. But at the same time, it's not exactly the lightest or slimmest phone available (even for a slider). The 528MHz Processor and 256MB RAM also give the X1 enough horsepower to run smoothly...most of the time.