I recently added Surface to one of our LiveView apps and didn’t face any challenges. As @hauleth mentioned, Surface is only a compiler so the underlying components are LiveViews and your controller code doesn’t need to change at all.
That said, there is a useful @data macro for assigns that you could use. Since it’s pretty early days, you may find yourself building some components yourself (we have a custom table, panel and buttons).
I am not entirely sure how I feel about having part of the app in pure LiveView and part of it in Surface. I have decided to pause the migration and wait for the upcoming Phoenix.Component (EDIT).
