Not so much an issue, but I put together a demo project which may help others trying to integrate SMCalloutView with the new Google Maps iOS SDK.
Their SDK allows specifying a custom view for a callout, but it handles the positioning and displaying of that view for you - so you miss out on the 'bounce' display animation, and controls within the view did not work. I had to resort to displaying and moving the callout manually with the map delegate calls the SDK provides.
This is great, playing with it now!
I referenced this issue from the README so people can discover your project. Closing this issue for now.