I’ve had my TX since last year (April) am still liking it.
Yes the fan noise is loud, but that is if I’m playing games on it.
It never bothered me, imho. TZ looks very much well-built because
it looks like it has less exterior parts than the TX.
Plus the TZ are Dual-cores 1.06Ghz, and online/Sonystyle they have the 1.2 Dual-core ULVs.
The TX only has either 1.3Ghz or that Core Solo ULV processor running at 1.2Ghz.
I love the keyboard in TZ, it’s like MAC. hehe..
But other than that,the OS, processor and the Intel
Graphics card, it’s almost the same spec.
The price/configuration I liked was almost 3k USD.
And I just upgraded my TX to a 32Gb Flash Drive, which btw
makes things runs faster in all aspect, for me.
If you’re in a budget that price is good. Plus if you
broke your keyboard on a TX you can easily replace it,
it’s around 60 bucks for that parts from Sony Parts.
But on the TZ, since it’s new and the keys are embedded,
you probably will have a hard time replacing it.
I am just saying this because you said you’re going to be typing
primarily on the laptop.