I've only really played with the Acer Aspire. It seemed like the screen was easy enough to read. I opened a Works word processor document, and adjusted to fit the width of the screen, it was more than acceptable. As for screen, the Acer could work for my (heavy) word processing needs.
Web pages may be a problem, although that depends on the site. This one, if I recalled right, opened nicely. Other sites, however, might not be easily readable and need font size increase, which will then (because of the site's design) end up calling for horizontal scrolling. But these sites days are probably numbered--between netbooks and iPhones, a designer can't assume that people will always be using a large monitor.
The biggest complaint I had with the Acer (and some other netbooks) is that the screen is glossy. It reflects light easily. In the store, it was bad, and in use it could be bad. At home, one can set the computer up so this isn't a problem. Other places, like my local library, are other issue. This issue, however, is not one that would bother everyone. It's worth thinking about and comparing--what do you want? Matte (non reflective) or glossy (reflective)?
As for Word documents, it might or might not. I THINK it does support them, but I've heard that the support can be a problem with some formatting. However, there is another option: OpenOffice.org. OpenOffice.org Writer is like Word (different in some ways, but similar in that it's "feature rich." It can open Word documents. And, best of all, it's free. The link:
The official home page of the Apache OpenOffice open source project, home of OpenOffice Writer, Calc, Impress, Draw and Base.
www.openoffice.org