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The build is not particularly good, after a year of (admittedly constant) use, there are obvious signs of wear. Anywhere my hands tend to rest has marks from the surface paint being rubbed off. The battery barely lasts 1.5 hours after a year and that is despite being plugged in the vast majority of the time it was in use. Having said this, the machine is not falling apart so I will not rate the quality as poor, its just not as good as some of it's competitors.
The tablet comes with the 32 bit version of Windows 7 and Toshiba does not provide a full set of drivers for the 64 bit version. This is a strange omission given you have to upgrade to the 64 bit version of Windows if you want to install more than 4 Gigabytes of RAM.
One particular annoyance is that if I turn the speaker volume to mute, and shut down, the setting is reversed on re-booting and the machine announces its presence every time it switches on (annoying given I do research in libraries reasonably often). On the other hand, I do like how quickly you can adjust the volume as there is a dial located in easy reach.
As with any TabletPC (ie laptop with a monitor that flips around and a pen) there is a key weakness in that the vast majority of software does not yet support touch screens or stylus (ie pen) input. Windows 8 and the new version of Office may fix this, but Windows 7 functionality remains limited.