I have my Android phone for music (and a 32 GB storage card). I love to use Netflix on my Kindle Fire, read books and browse the web. All things that it does better than my phone. I have a Kindle and love it for reading books, but the Fire is better at night (black screen with white text) makes it easier to read in bed without additional lights.
I don't miss a storage slot at all. Personally, I like the lack of any hardware buttons like the volume rocker, and rotation lock. I prefer these on software, fewer things to break.