I love having the issues on my iPad, since as a road warrior its nice to read them on the go, but that also leads to my biggest frustration. The app requires a data connection to keep you logged in. So sitting on a plane, with hours free to read, and I cant because the app can't confirm my account, and logs me out after a couple of minutes, assuming I could open the app in the first place.
I already logged in to download the issues, so why do i need an active data connection to read them? To me that undermines the entire point of downloading the issues v cloud browsing.