I'd say it depends on what you want to get done with it. It is fussy to set up, X applications are ridiculously slow, and you'd better have good eyes to read the websites you surf to (or put up with magnifying and scrolling). On the other hand, it is something you can have no matter where you go, no small thing.
The 100v adapter works in the US, although a few people might dispute that. But it appears to be settled. The English conversion I don't know about, mine was already done. It does not run warm that I can tell, and (without the hard drive or keeping the internet connection going, so I hear), the battery lasts very long.
Right now mine is sitting on the shelf, because I grew frustrated with trying to get it to do what I want it to (run a spreadsheet). But I'll probably take a crack at it again in a while. Bottom line, if you have to depend on it for time-critical work, don't. The investment of time to get it set up is substantial, unless perhaps you are a true linux guru.