I love the portability and the huge size of the library one can carry around -- something for every mood.
But I don't like the fact that some books are not available in eformat at all and others are subject to geographic restrictions.
I wish all ereaders had a common format or were versatile enough to read different formats and I wish we had a global market in ebooks.
I think it is iniquitous that ebooks are subject to tax when pbooks aren't. (See
this.)