The eggrider looks like it replaces my C961 display with a module that sends the same data to a phone. It might have some short cuts so a single button gets into the BBS programming mode and quickly sets things like the number of PAS levels, maximum speed. It adds a trip odometer, maybe two of them. But basically, I see nothing more in the info than what's already in the various BBS02 displays.
No I do not want one, not even if you gave me $50. My damn Samsung phones are problematic when outside. Always low on battery. Apps hang up. Cannot see display in the sun. Why would I want to mess up a bike ride by having to depend on my phone.
There are more critical registers inside the controller that set max current, PAS power levels, etc, and I would think it feasible for the unit to access them, but probably not possible when the motor is running.
In the future, if they linked the app to GPS and acceleration sensors in the phone, you could get realtime display on the road grade, and get Strava like data. But you can get that now.