While ebooks have their place, quilting for me (including the books!) is a more hands on experience. I have vision issues and listen to audio books since I can't really read for pleasure any more (on line and I can enlarge/adjust brightness and such), but keep in mind with an ebook it isn't any bigger than the screen you choose to view it on. Maybe a computer monitor is big enough, but a tablet just wouldn't do in my opinion. And I just don't trust myself to take my tablet into my bubble bath with me
Being near Seattle, I have access to a great library system and get my audio books for free. You might look to see what you have locally to you and try one out (quilting or not) and see how you like it.