I tried many reader, from freda to mohoo, I liked Bookviser but lack of SD card support made me to switch to Coffee Reader.
Coffee Reader was I think the first app which (in my humble opinion) contain all the necessary + advance features but at that time it lacked Stability.
Then I found Tucan Reader and my search for best ebook reader ended.It is the most stable app I ever found (on my lumia 520 wp8).It contains all various basic and advance features that I need.Also I can reads the ebook .We can also control brightness an other stuffs necessary for night reading.Support SD card,Gdrive, OneDrive and many more.If some how they could make pdf file support in future then it will rocks.