You've hit upon the most important reasons why so many people choose eInk readers.
Really, you've already pointed out and answered your questions.
The real question (in my opinion) is to go over to the Which One Should I Buy Forum and pick the brains of all our members on which one you should buy that meets your needs.
An ebook reader is like a good marriage.....and certainly with less stress!
[Refresh your page, as I've edited my original post for clarification.]