"PDF Expert 5 is one of my must-have iPad apps and a desktop-class PDF reader" - MacStories.net
"I was blown away at how easy the app is to use" - MakeUseOf.
"The best app for managing, editing, and reading PDFs on your iPad" - The Sweet Setup.
You can open various file formats such as iWork, MS Office, PowerPoint, text files, images, even music and video files, etc. Get these files from desktop computers, email attachments, documents on Dropbox, OneDrive, GoogleDocs and "Open in" from other applications.