Superfluous

When I first wanted to buy an ereader, I held off because I decided the sony version had more of the bells and whistles I wanted for reading and commenting on research articles. But it wasn't available, so I bought a kindle and generally loved it. Now sony has a new version out, with all the bells and whistles. So I bought it. The plan is to test it out for all those work things as well as rereading Andreas touchstone novels on it.
In my short reading of things so far I think that the kindle will be more useful for generic reading (I am suspicious that I'll be able to get a wider range of stuff as mobi files - unless its on smashwords of course) and the sony will be easier to make the sorts of impulse notes over documents that I want to make on my pdf's - and its touchscreen - glee!. The sony store in Australia is not yet up, so I have to download from my computer....but since that's what I do with the kindle anyway, its not a great loss.
Anyhoo, at some point if I'm diligent, I'll put up my personal pros and cons for the two. If it turns out that the sony does everything the kindle does just as well (including book variety), my little brother might get an unexpected kindle present.
For the people for whom the cover is important; I have a black kindle with blue case and a red Sony with red case - red goes faster, don't you know.