Best tablet under $50. Runs relatively quick, has a decent selection from the app store, and has a nice battery life . Also has an awesome setting to reduce blue light at night and help keep you from staying up too late
It's not super fast with loading speeds, but it does what you want it to do. The app selection is very limited compared to apple and android tablets, but they still have popular apps like Facebook and candy crush.
I love my Kindle, it's great for reading books and Netflix... in that aspect, if that's all you want to use it for, it's awesome! However if you want to use it for anything else, I would recommend an iPad.