I've been using Nokia maps v1.2 with E60 and they work fine. One thing which bothers me is following.
Whenever I install maps software seems to be unaware of installed maps. This means, for example, if I have 6 countries and now I wish to remove 3 I can only delete ALL maps and then install 3 that I need. I see this as flaw in software as software should be able to recognize what maps are installed on storage target and users should be able to remove individual maps without being forced to remove all of them.