I have been using my Sony Ericsson Xperia X1 for about a week, so now I'm trying to write my review about this phone. I'm not really too good in reviewing gadgets so I will try to keep my review short. Especially, since I have been using this phone for only a week. I might write another review again after I have used the phone for quite some time.
I was considering this phone and HTC Touch Pro over other Windows Mobile-based PDA phones like Samsung Omnia or HTC Touch Diamond because of an obvious reason, the sliding keyboard. And frankly, I was quite disappointed with Xperia X1's keyboard, initially. Its flat surface makes me difficult to type on the keyboard. The good news is that I managed to get over with the difficulties over time. Once I have gotten use to it, I find the keyboard is still much more convenient to type compared to if I have to use the stylus and the on-screen keyboard. While typing, the optical joystick is also quite useful to replace the arrow keys, which are not available on Xperia X1's keyboard.
With regards to the interface, many people said that the Xperia X1's panel is not as good as HTC's TouchFlo 3D. I haven't tried the TouchFlo 3D myself, although we can actually port over TouchFlo 3D interface into the Xperia X1. However, I am personally satisfied with the Sony Ericsson panel. I can put the clock, calendar, weather, appointments and some shortcut buttons, all in one display. That said, I really appreciate the big (and somewhat long) screen that the Xperia X1 has.
The GPS also works like a charm. Its built-in internal GPS receiver locks on to the satellites much faster than my Garmin GPS 10x receiver. I have installed my favourite Garmin Mobile XT software into the phone, and it can detect the built-in GPS receiver without any issues. I also do not need to activate my favourite GPS proxy software, WMMiniGPS, for the GMXT to work, although sometimes I would still turn on the WMMiniGPS if I need to do 1-second tracking for my contributions to Malsingmaps and Malfreemaps.
After getting used to only GPRS connection on my old Dopod 818 Pro, I find the high-speed downlink packet access (HSDPA, or 3.5G connection) to be much rewarding. Paired with Wi-Fi capabilities, the phone makes my microblogging activitiy much more fun and definitely faster. Browsing the Internet using the pre-loaded Opera Mobile software is really fun, and thanks to a bigger display, I can see more on the screen compared to my older phone. So guys, expect to see more of my updates on Kronologger, Twitter, Plurk and Facebook. :) :)
The only downside I can think of now, is the battery. It drains very fast under heavy usage. Yes, I am a heavy user of the phone, since I use it for phone, SMS, GPS (every time I drive around), and the Internet (mainly for microblogging). And I have to charge the phone almost every night. A 100% bar of battery in the morning can drop to a 20-30% bar in the evening. Understand that this is normal for a PDA phone, however I still wish that Sony Ericsson can invent a more powerful and long-lasting battery for this phone. :)
Well, that's what I can think of right now. I might write more reviews once I explore more on the features of this phone. Stay tuned. :)