Have had the 4211 for a few months now and have to say there are a few issues coming to light.
the first is that there are bios updates and various driver fixes, but inexplicably they see saw up and down the version numbers as they are 'tested' by users and withdrawn. Still think it will settle down soon though but the appearance of being used as a beta guinea pig persists.
Main problem is that when new, the whole thing was zippy and after installing standard Office, Sketchup and various other bits, all worked fine, even with a few applications simultaneously running. A few months later, everything is slowing down. Have virus checked and adawared and found nothing amiss, but I suspect that the processor and system cannot cope with the demands of windows XP and its constant updates and security fixes. Using Word and other office software is fine by itself, but the whole thing slows down quite a bit when other programs are open. It is particularly slow at returning control to a program when you switch to its window. This hints at a memory problem but considering the 1GB memory and XP, this should not be so much of an issue.
I am still recommending them for use by Diploma students needing a cheap small portable device, but I am investigating something with more beef for my general work... I strongly suspect that the dual core Atom processors coming by Christmas, when combined with a second generation motherboard to match it will sort a lot of the issues out but for now, a good tiny computer for general use, but NOT a replacement for a standard laptop specced by the ICT literate!