I gave it a try and used a simple Excel file (with tables) to create a PowerApp. Customization wasn't too painful. However when more than one person needed to use it, it was locked because the Excel data source could not be accessed by more than one user at the same time :-(. I should have used Sharepoint lists instead. So, the simple thing of working with familiar apps like Excel and creating a form entry on top of it was disappointing.
