Hi,
I love MN4. On Ipad and Mac it works like a charm. However, compared to the MN3 experience on iOS the app is just too crowded.
About 20-30% of the screen space on horizontal mode is covered by the multitude of toolbar. Additionally, in order to be able to navigate through my many PDFs I need to have an option enabled, this is not efficient.
Also, the toolbar to select pencil, cropping, selection, etc is always shown, but it could easily be moved elsewhere or at least, hide the bar to go back to the study set view.
Lastly, the table of contents section can only be viewed on horizontal mode, since while vertical the bars are too crowded and it gets pushed to the right, out of view.
Overall, the app works great, but I think MN4 iOS could still use some work in terms of UI to make better use of the screen real-estate.
Cheers!