Fastest PDF reader I've seen for Android up till now. Great performance even on low-end tablets. Simple but effective flow for reading: Tapping on the right side of the document either advances to the next page or  if you are zoomed in  moves to the next unread part of the page. Perfect for Calibre Companion users bzw. Also: No Ads  no in-app purchases. Software is open source  code is available from Artifex (makers of Ghostscript).
June 28 2016