I've messed around with one. They're not to bad at all. A mate at work bought one and let me borrow it for a couple of days. The viewing angles are fine when it's in landscape mode, but are narrower in portrait. They do seem to have them in stock in some PC World stores, I would recommend that you go and try one out.
I'm planning to buy one as soon as I can afford it, but I just bought a DSLR and I gotta get the cambelt one my 182 done :-(