The performance of the X1 is the best I've ever seen on any Windows Mobile device. There is little to no hesitation when launching programs and flipping through various screens. This makes using the X1 very pleasing. The only area that needs work is the Panel interface - there's a slight lag between pressing the Panel hardware button and when the Panels come up on the screen. Also, rotating the Panel screen from portrait to landscape gets a bit choppy.
BATTERY
The battery on the XPERIA X1 is 1500mAh, which is larger than the Touch Pro (which packs 1350mAh). The battery life on the XPERIA X1, to my utmost surprise, was fantastic. I'd get to the end of the day and still have around 50% battery left after a ton of use. With other similar devices, I'm lucky if there is 20% remaining. So, with heavy use of data, GPS, and many calls, the X1 will get through 1.5-2 days. With moderate use, you will get through around 2.5 days, and with light use, expect 4 days. Sony Ericsson did a great job on battery optimization.
BUGS AND WISHES
Because Sony Ericsson spend many months with the X1 in testing, the device is very well optimized. All of the software worked well, and I didn't have to soft reset but once, and that was required because of a cellular data issue.
PROS
Panel interface is interesting and holds potential
Amazing performance
Outstanding battery life
Crisp and bright WVGA screen with high touch sensitivity
Near instant screen rotation
Has a 3.5mm headphone jack
Includes optical D-Pad plus standard D-Pad
Flick-scrolling throughout
Auto-configures for major carriers (AT&T & T-Mobile in the US included)
Innovative four-way LED notification system
Great build quality with use of real metal
Top-notch camera
aGPS/WiFi/HSDPA/FM Radio
CONS
Poor one-handed usability
Choice of Panels is currently scarce
Recessed screen traps debris
No case/screen protector included
No voice recognition software
microSD slot is under battery cover
Lacks an accelerometer
OVERALL IMPRESSION
This is the best Windows Mobile device that has ever passed my desk. Period. Sony Ericsson was right by declaring it a "game changer" - this has raised the bar, and if the Panel interface takes off and we see a lot of neat Panels, the X1 could become a benchmark mobile device.
Not only is the X1 refined from top to bottom, but it brings a new interface paradigm that challenges our idea of what a Windows Mobile Today screen should be. I was super impressed by its high performance and excellent battery life, and was refreshed by the sensitivity and clarity of the high-resolution touchscreen. If you're big on one-handed use, this device is not for you. But for everyone else that desires a powerhouse of a device, this is definitely it.
