I am on the verge of purchasing an ebook reader. I currently read most of my books on my iPad or iPhone. However I have found that in some cases this is not the most reliable readers.
I find my iPhone great because it is always with me. However it is not good in the Sun or the beach (sand). The iPad is a better experience but I typically forget it when we travel.
I have been looking at a book (non color ). I can get books from the library and it does ePub format. Though I use kindle on my iPhone and iPad I think this the better choice. The kindle may have the better system to purchase books bit I am cheap and the library does a good job.
In a similar topic here are some views regarding hard cover books and ebooks
http://m.cnet.com/Article.rbml?nid=20051201&cid=latest&bid=82&webref=reviews.cnet.com/8301-18438_7-20051201-82.html%3f
The cost of an ebook is as much or more than the hard cover. This is based onthe release date. I’m not against this. But I find the value difficult to stomach when the production of an ebook costs next to nothing and takes about an hour.