I, too, am a long time user of GoodReader. One of the most recent features that I just discovered was listening to an audio file, using GoodReader, and simultaneously viewing the pdf. In the Reading View there is an icon to bring up the audio control... Simply put - brilliant idea. I have better control here than using any other audio solution.
I needed to clear up an iOS device; and the pdf files from GoodReader needed safe storage off of the iOS. GoodReaders in-line help system, to the rescue, with easy to understand screen shots and text to create the Wi-Fi browser connectivity. Very impressive to a non-geek type.
What are you waiting for? Find out for yourself why GoodReader does what it says, and then more.