The POW2 is extraordinarily impressive. However, I have realised that most features and functionality always revolve around a particular unit of switch. As an example POW2 can record usage statistic. However, if you have 5 POW2 at home, its a very manual task to consolidate data from all 5 POW2 units. There should be some sort of dashboard where users can combine and sort the statistical data according to their needs. If that is too complex, at least a API should be available for users to do that.
Because at the end, when a whole house is integrated using may Sonoff switches, its absolutely not useful to have reading on only one switch at a time