As with any device I review, I like to use it for a two week period or so. This gives me a much more 'real-world' perspective on it, instead of a sterile lab review. Sure, I could glisten over every fact, but the point is more consumers are buying these devices, not tech junkies.
I'm currently juggling a Nexus 4, Galaxy Note II (our next review) and the Xperia TX. The Xperia TX is a fine handset, and somewhat of a surprise for me being a decent Sony device. I haven't even looked at a Sony phone since the Sony Ericsson days (were they that long ago now?) when flip phones were all the rage - before the Motorola RAZR became 'the' phone to own.
Sony have done a fine job with the Xperia TX, now the question you have to ask yourself - should you buy it? If I had to answer it for you, then I'll fall back to my usual point of - we're in a world of Android dominance right now. Google is at an all time high with their mobile OS, and I just don't know how any other companies are going to be able to compete in the cut-throat market that is the smartphone world.
Google can partner up with whomever they choose - Samsung, LG, ASUS - and tell them a price they'd like to hit for a certain device. At $349, the Nexus 4 is just too cheap to pass up. The Xperia TX is more than this, and even though it might be just $70 more, you're not getting $70 more of smartphone with the Xperia TX.
The next point will come with what devices you have at home, are you running more Sony-branded devices at home? Then the Xperia TX is something you'd look into, with this being an actual selling point for Sony.
I enjoyed my time with the Xperia TX, and was surprised with its lightweight, good battery life and Timescape UI skin. If you're in the market for a Sony device specifically, take the time to check out Sony's Xperia TX. If not, there may be better options out there to buy.