I've been using it on my iPhone 5 for a while and don't have an issue with it.
Admittedly I don't use the built-in Maps app much which seems to have been most people's bone of contention. I suspect Apple are working on a fix for that, but fixes will be released gradually but ASAP. I've got a copy of London AZ and various other city maps whose format I prefer anyway.
Last edited by mixture; 22nd Oct 2012 at 07:23.