I have used Amazon Kindles for years, but I turn off the Internet update function as soon as I get them and never buy ebooks from Amazon. I either download free ebooks or buy them from other sources (usually in .pub format). I convert them to Kindle format and upload them from my PC to my Kindle using a free program called Calibre.
I highly recommend Calibre to anyone who has ebooks.
I doubt I will ever read an e-book. I can imagine that I would be in a critical scene and suddenly the computer goes down. That happens to me just about every time I try anything new. I have been reading books since age 5. Never disappointed and have 4 large book cases full after giving away at least a ton. Books I like I reread over and over. Love the classics. I kept most of my religious books from college & seminary.