Hi, I just got my Q550 this week, and I mostly like it, but it's a bit heavy if you hold it for a long time, so I'm thinking about buying the 2-cell battery, because I'm only using it at home and not for 8 hours straight. Now does anyone know the exact weight difference between the two batteries? On the web pages, I can only find rough values. And I also haven't found a store that will ship to Germany. About my first impression: It was a bit hard to wait for the 45 minutes until windows was finally installed. And you can really tell it's not a "native" tablet OS because you have to install all the tablet features (automatic rotation, webcam, touch interface etc.) Separately. But I'm still hopeful that after the installation marathon it will work.