I have plone 5 all working ok, and it asked me if we wanted to convert from archetypes to dexterity, and I changed it.
the maps plugin I have for plone4 works fine. google maps api works great.
for plone5, it is not supported, and collection.geo has a lot more features.
buildout worked fine per instructions.
when i go to the config, i have 2 issues i can see:
instead of tons of content types, i only have comment, folder, collection, and location (which is an old archetype from plone 4 upgrade).
no file or other options per the documentation
even with a valid API key, the map itself does not show up in the add-on config page for collection.geo