Kindle3 wifi. I am happy with it. The design is not exactly at the level of the screen and of the software, but it is also quite cheap and sturdy. Very easy and practical, like a VW.
iPad 2 3G. The weakest use is posting, as it is tragically one single window/process at the time. Blast them. They have always been just one tiny step from perfection, but never there actually.
I use the Kindle at home and on long trips, like now that I took almost two weeks of holidays abroad. I have not read much
, but I haven't charged it yet.
During the week, at home, at work and on the train, I use the iPad heavily. I have a routine by which the charge lasts me for the whole day.
I use a lot my touch 4. It is great for reading on the train and in metro. It is so slim that I carry it in the pocket. The use of it that I prefer is with the pictures. I have a bunch of information, shopping lists, things to do, etc, organized in photos. Consulting them on the go is very easy and effective. Lately I started hand writing reminders and things to do with the pen on iPad, exporting it as a picture, mailing it to myself and using it on the touch, on the go.