I’ve only ever purchased two magazines. I’ve unsubscribed from one, and the other I cannot update the app.
I’ve already unsubscribed from Consumer Reports after being a subscriber for 19 years because they held my content hostage for 14 weeks over 3 incidents. They never acknowledged it, when called they blamed Apple, they never compensated for the outage time, and they never apologized. Simply the worst customer service from an organization that holds other companies to a much higher standard than themselves.
The second magazine app is quite poor. The content is designed for the print magazine so many articles are spread across two pages requiring constant zooming and scrolling. It doesn’t remember which issue you’re reading. If you bookmark a page there’s no way to remove the bookmark. Turning to a new page on an iPad 3 takes 8 (eight) seconds. I’m not kidding.