To read ink or e-ink, what is your choice?

I'm all for good old paper and ink, there's nothing quite like a smell of brand new book, a creak of the hard cover when you open it for the first time, finding things left between the pages in library books and the libraries of course, so much more interesting and welcoming than a list of titles on the website.

But.

I can carry my e-reader with me all day without twinges and stiffness in my arms and back, even if the book I'm reading is 600 pages + long, it reads just like a page printed in ink and I can get all the classics I long promised myself to read and even library books on it.

Thoughts and opinions?