I purchased this app for use in college. A lot of my teachers give assignments where I have a pdf to read, annotate, and bring in for class discussions. Rather than demolish a forest, I figured I could use my iPad and/or iPhone for this purpose. (Please note: my iPad is an Air 2 and my iPhone, a 6 plus. They both have 128 gb of internal storage. My problems are not related to device problems)
Overall, the annotation features are very smooth and work well. Text highlighting in particular works extremely well.
My issue are the overwhelming number of bugs this app has. Frequently upon loading a saved folder (thatll have, say, five important PDFs in it), theyll disappear suddenly, with no explanation. The app will reload my home screen and my valuable work will be completely lost and irrecoverable.
There are also bugs with the display. On zooming in, a large white rectangle will appear unpredictably over a large portion of the page, and it can be difficult to fix.
Finally, some important features are missing. What about cropping? That seems like it would be a fairly basic feature, all things considered.
2/5 stars; its good but unreliable enough I have to find a better (more stable) app.