I can't offer a citation, but I work with a lot of individual and corporate computer clients so I think I can speak with larger-than-just-anecdotal/personal experience when I say that yes, PDF is disliked by a significant number of users. Was a boon when it came out, replacing more difficult postscript files. GoodReader PDF Editor & Viewer currently costs $2.99 for the base app, but that is as part of a current 50% discount offer. Upgrading to the Pro Pack adds in split-screen for reading two documents side-by-side on an iPad, AES-256 encryption, and file synching, among other extras. Unusually, the base app is one that requires purchasing instead of being free, though there is also an additional subscription element as well. It can even connect to cloud storage services, as well as data stores such as WebDAV, SMB, AFP, FTP, and SFTP. The app is able to handle file management as well, collecting together files in one place, including those it cannot open itself. Annotation tools include highlighting text and adding notes, as well as drawings, which can then be shared with others for collaboration purposes. You have reading tools like PDF Reflow, which can make the text of a document easier to read on smaller screens without needing to constantly scroll sideways. GoodReader has existed for over a decade, and is one of the best PDF-reading apps available today.
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