I still have my 505 (with a cracked screen) and my 650. I do/did love the 650, but I almost never use it

I've found it easier to use the Kindle App on my Samsung and my iPad mini. I'm not even sure I remember how to sideload books onto my 650. I needed the iPad for classes and it seemed overkill to stick the 650 in my bag along with the iPad. But there's nothing like that paperwhite. So much nicer than the Kindle app stuff I use.