Good Reader maybe should be called Great Reader, because it lets me read multiple formats of files with just itself. The interface has improved a bunch in this version (4.12.1), and it is recognized as a possible e-reader in iOS 9.3.1, allowing me to transition downloaded PDFs into GR.
Now, if we could just get all the publishers of ebooks to standardize their file formats into GoodReader or iBooks...
RiverCityJim about GoodReader PDF Editor & Viewer