After a few days of use, I can say that the Nexus 10 is quite a nice device. I was a little bit disappointed that:

• I struggled so much to login the first time using my Google account (mandatory to use the tablet). After many attempts, I could login using the browser interface (and not the native interface)
• During these attempts, I tried to change the keyboard layout, and I found myself stuck in the keyboard configuration because the button 「back」is not present at this stage (what a stupid bug). I had to reboot to try again.
• Transferring files using MTP (official way using USB) or FTP (limited by the wi-fi bandwidth) is super slow. Using ADB gave a descent 5Mo/s, but come on, using a debugging tool for such a thing is a shame
• Charging the battery takes forever if you are using the device (I even wonder if it is charging at all).
• The autonomy is not impressive
• No cover is present in the package (my EEE-PC had one for a smaller price)
• I had a complete freeze after starting Chrome once (I barely use it), and I am not the only one
• These random reboots, grrrr (lost some work)
• Sometimes, the automatic time sync get wrong by exactly 10 minutes, and the only solution is to disable it
• Some apps look really ugly on a tablet

Now the good points:

• Android 4 is really nice to use, not perfect, but really nice
• Always very responsive, it doesn’t feel like a computer or a phone but like a physical object. It always reacts immediately. That is so great not to have to wait (well, excepted for network comm). On my (fast) PC, if I start Kate, I have to wait a few seconds (wait for a text-editor to start!?). On my Android phone, switching from an app to another is sometimes slow because of the lack of memory.
• Even Firefox is fast (on my phone its start-up is slow)
• Does not come with crap like Facebook or trial apps you will never use
• The screen looks sooo great
• Voice search is fun (even if it doesn’t always work well)
• Using voice recognition (not) to type is also fun

I was a little bit sceptic at first, but I may become one of those who use their computer once in a while. Well, I will still need it to edit my Anki packets, type long emails, edit Openstreetmap, order and edit my photo, write code and things like that, but I have to admit that for the rest (browsing and reading, listening to music,  endless watching pointless streaming video) the concept is fantastic (thanks Steve).