It's as proprietary as Apple's stuff. It came with one month free Prime service, which includes borrowing books for free for the one month.
I had to call Amazon support to get my Roku box to work with Amazon.
I downloaded a free book and read about half. Why didn't I finish? Amazon removed the book from MY device in MY home! How did I find out? Read on.
I tried to order something on Amazon and was going to be charged for shipping, which is supposed to be free for Prime service members (actually I learned that's only if Amazon actually does the shipping). I stopped the order and asked Amazon some questions. That's how I learned that my Prime service had been cancelled. No e-mail follow-ups. No reminders. No final warning. Zippo.
Amazon cancelled my Prime service, I guess after one month. I received one e-mail message reminding me that my one month was coming due. What company sends just one such message? Only Amazon as far as I know.
I lost my book and my Roku setup. Amazon was completely clueless about my outrage and did nothing to placate me. It's two days before Christmas and I'm looking for a buyer. Failing that I will see if someone has posted actual instructions on how to install Android 4.0 ice cream including WiFi.
I will not order anything from Amazon again with or without the Kindke Fire.