I used SidePilot successfully yesterday (iPhone 6) for a Search and Rescue training. I had to buy for the $9.99 since I needed something. It's not so user friendly or intuitive. I only needed video feed and it worked, but I don't think there was any flight data such as elevation, etc. I think it was just the GoPro screen view.
I did 2 things to set it up:
[First, Power up all the Solo stuff, connect the Wifi if not already.]
1) From the main screen with the map, go to the MENU by touching the 3 bars in the upper left corner. From the list, select Video Stream, then select Settings in upper right, select 3DR SOLO.
2) On the MENU list, I selected Help and Settings, at Connection Settings, select 3DR SOLO.
Go back to the Main screen and touch the upper right antennae thing to Connect. Now you have flight and battery data on the Map Screen, but it is on a separate screen from the video feed screen, and it ain't as easy as I would like to toggle back and forth, but it does have a good voice alert lady that warns you of things. I found the ARM feature to be useless for the 3DR Solo.
If I learn anything else, I'll let you know. Hey, it works
-Tom