Not the best
The app is decent to read the magazine but it is not better than most web sites, you cant zoom, and there is no way to change the text size (it ignores the IOS settings too).
The download size is huge (> 500MB per mag) and it cant download when in the background or sleeping. You also have to download it all to read it (no downloading while you read).
Also, if you cancel your subscription, you dont have access to the magazines you paid for.
WhoaaBoy about
Popular Science, v4.4.1