The problem with the Advent/Wind and you will see this for yourself if you go to a store and have a look is it's closer in size and appearance to a laptop than a netbook which kind of defeats the point of having a netbook.
Hardly....MSI Wind 260 x 180 x 31mm compared to 249 x 170 x 29mm for the Acer Aspire One . 11mm max difference is not a lot.
It's just like reading a 10inch book compared to an 8.9in one.
I also have the Advent and having played with this the Acer and the Asus I think the build quality and size is perfect. I don't know what the problem is with how it looks, give me a netbook that looks more like a laptop than a V-Tech kids toy anyday.
The disappointing thing with the Advent / MSI Wind, is I feel the extra screen size is wasted with out a resolution upgrade.
You may be interested in the new Dell mini 9.. @ £299, it looks like its going to be a superb little gadget!!
http://gadgetspot.co.uk/2008/09/12/dell-mini-9-netbook-unboxing/