I love Sonos, their devices are way ahead of the competition. But their app just plain sucks. What is the most important function of a remote control app? Adjusting volume — and yet the useful range for the volume control occupies less than a percent of the entire touchscreen. It is very difficult to adjust the volume. And Sonos gives you no way to set the useful range, so you often end up blasting your ears with monstrously loud music, because you didn't tap the control just right.
This has been reported to Sonos numerous times and yet we still have to suffer with the crippled volume control.
Here is hoping that there will be an alternative.