Digital Editions on Mobile Devices

So, we have just learned that Zmags, our digital editions provider, has launched a plug in for the website that detects, automatically, if you are trying to access a digital edition of a magazine from a mobile device. This seems to work pretty well on both the iPad and the iPhone, but I have not tried it on any other device. However, I’m still not convinced that it’s better than using GoodReader with the full PDF. Also, currently, there is no support for authentication so only Issue 1 is available in this way anyway. If anyone has any views on digital editions for mobiles I’d love to hear them, but I’m starting to think that a custom app that is optimised for a publication is always going to win hands down. Any views?