We know a lot of Website using ‘Responsive-Design’. The Keyfeature are the defined Breakpoint, e.g.:
Phone: 0 < 320px
Phablet: 321px < 600
Tablet: 600 < 768
Great to define Breakpoint by Profile in Piwik to get Reports on the exisiting channels by Website, e.g. How many poeple visted page x on which channel.
This features allows customer to optimize their channels and improve pages based on statistics.