Still the best PDF app, but...
Ive adopted the entire Readdle suite for iPad productivity, in part because of how well the apps integrate with each other and especially with Documents for general file management.
However, two changes have been made from v4 to v5 that I view as small steps backward. First, there is no longer an ON / OFF switch for keeping multiple documents open in tabs. Unless I am specifically comparing two documents, I normally have left this feature OFF (in v4) to reduce screen clutter and memory overhead.
Second, full-screen mode no longer shows the thin black status bar with wifi strength, battery status and so forth. While this is not a big deal, what happens instead is that the full-screen doc displays offset by blank space (split above and below) representing the area where the status bar once appeared in v4. Given a choice, I prefer seeing the status bar, as being able to monitor network and battery status while working in a large document has been useful to me.
Also one feature request. Could the popup window that appears for Search, Bookmark, Share buttons in the upper right corner be redesigned as an embedded pane to the right of the document in landscape mode? This would enable, for example, stepping quickly through several references to a Search keyword while viewing the document unobstructed on the left; currently the popup sits on top of the centered document and often obscures the keyword thats being referenced.
Summary: I cannot imagine using a different PDF app because this one is truly excellent, but the best can always be made even better.
Skytouch about
PDF Expert - Edit, Sign, Read, v5.5.7