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I bought an X30 second hand on ebay around 4 years ago and it is still going strong.
The unit is very small and reasonably light. The battery is still the original, I think, and as it is so old it struggles to hold charge but I can still get over an hour out of it.
I use the computer for the internet really and it does a great job. I also use it for office applications however, more recent versions are starting to run a bit slowly.
The major drawback is the lack of any disk or cd drive. I have found it nearly impossible to get new programs onto the laptop or restore old ones following an inevitable virus.
To my mind this is the near perfect internet surfing machine but not much good for anything else in todays world. The build quality is top notch and if you can find one around I would recomend it for keeping next to the sofa and using when watching TV ect (internet poker anyone?).
It does not have a wireless capability built in but does have the necessary slot for it and works well.