I've been using the Asus ZenPad S8 Z580CA-C1-BK as my main tablet for the last 4 months. It replaces my iPad Mini 2. Simply, the S8 is a great tablet with horrible, horrible battery life.
Its a really fast quad-core Intel-based Android tablet. All my apps run without lag. I have a micro SD card to store MOOC videos. Even the bloatware is tolerable. 4 GB RAM and 64 GB storage for $299. Fantastic!
The only serious downside is the battery life. Under heavy use, it needs to be recharged over night. There is no way around it. Under similar usage my iPad Mini could last two days with out recharging.
The only other problem is the USB 3.1 C-type connector. The cables are really crazy expensive. The one I bought from Monoprice cost $9.99. Sheer robbery.