willie_non There aren't known issues with the sandboxed Google Play compatibility layer but it's expected there will be more things to fix since we already had to make several changes to it.
There are assorted aesthetic issues to address such non-functional references to Google features which aren't included in the OS in the Settings app, etc.
There aren't really any significant known issues yet but we expect that there will be which is why it's not ready for the Alpha channel yet.