Does the app allow the various devices and device groups to be organized into rooms?

3-way dimmers and potential for 4-way switches and dimmer switches would definitely place TP-Link at having a complete smart suit. Any other products beyond this and your current offerings seem like...

Board4mic, Can you clarify the setup you used, are all three switches in the 4-way circuit the TP-Link smart 3-way switches? Or just two of them with a standard switch at one of the locations?