My experience is on an iPhone 6. This app really just seems to be a PDF page viewer. After downloading an issue, you scroll through (tiny) page after page, zooming and moving about read? There doesnt seem to be any way to bookmark you position either, so it is manual to come back to where you left off. This is essentially unworkable on a phone, Im sure an iPad would work better, but it is a sad effort for "Science" compared with the competition from across the sea.
TommyNorthAL about The Journal Science