If I could buy A4 size eInk reader weighting around 0,5kg I would never buy iPad.
I do read many standard PDF files so I just enjoy the easines of pinch and zoom. Web , mail etc. are just nice addons. It is still more convenient for me to use iPad and do a lot zooming than using PC or printing tons of paper.
Yeah, I do bought my iPad for reading that is why I am interested in MobileRead forum posts
The choice depends on what you gonna read. For novels I love to use my small K3.