A simple fix is to set the map no bigger than 583px.
Don't ask why but this seems to work, sort of hack but pointless really because you can only have small maps, which basically defeats the object.
I've been in and out of the google forums and it basically boils down to:
1. You can't remove the side panel unless you reduce the size to 583
2. Nothing works on mobile
3. Only the videos work in Chrome
Everything seems to still be in testing, not a good solution for live sites with lots of mobile traffic and small screens.
It still works very well though only on desktop and big screens. Its up to yourself if you'd like to use it.
Personally, sticking with the old maps for now maybe add an extra link to the new map for people on desktops.
One benefit I did find was that you can export you new KML data from your new maps and import your markers straight into you old map.
Saves adding loc etc. Just use a simple search.