I have an Asus 1001ha netbook running windows xp; it's a little bit buggy (something to do with the live update, it happens every 20 or 30 minutes, notifiying me that some exception or other occured and offering to let me debug, although selecting this option simply re-displays the same error message), and I often have trouble when trying to shut down (it hangs while installing an update; this problem is very probably linked to the error/error message that appears while operating the machine).
It is very light. The keyboard seems a bit small (although I am very clumsy even with a full size keyboard), but is otherwise quite nice to type on. It is quite nice to look at, and the screen does not have the problem of needing to look at it from a particular angle (on my notebook, if I am not looking at the screen from the right angle, the colours all look darker and there is much less contrast). The screen has a matt finish, and this actually does seem to be superior in that it apparently gets much less dusty and seems to get less smudges (or at least less visible smudges) than the "slick finish" screen on my notebook.
I have not used the netbook very much yet. I understand it boasts a long battery life, but I have yet to unpack and use the battery (I figure since batteries are consumables there is no need to use it until I actually need it, so I just operate using the power-cord).
I did think it was a bit "cheap" of Asus to supply an optical rom media for recovery. They could have charged a couple more dollars and provided the recovery stuff on a bootable USB instead (although, so far as I know, no one else provides recovery utilities on a bootable USB with their netbooks either; you can make one yourself, but I'd rather have a manufacturer provided one).
I have next to no data on the machine (aside from firefox I have not installed any applications that were not already on the hard drive, and I have not saved any documents/pictures/movies/audio files/etc). It is not the fastest at loading (but no slower than any of my other Windows PCs) and it seems to operate at a reliable speed when accessing email and websites (I have played Runescape on it without any problems or hangups for instance) although it may not cope so well if it were used to store too much data (it has fairly low hard drive and RAM specs). I have not used it to access Facebook. So far as live chat goes, I did use it for a live-chat session with HPCompaq's technical support the other morning (when my 3 month old notebook running Windows 7 decided to pitch a series of fits); it worked well and did not lag at all so far as I noticed.
It seems a nice enough, functional, but non-descript machine.