For new 3D Robotics SOLO owners, there's now a flight simulator that will let you practice before you get your SOLO in the air!
Note that this app is separate from the SOLO app. It connects wirelessly from your mobile device to your controller and displays the camera’s “first-person view” so you can get accustomed to seeing what the SOLO sees.
The best part is, you only need the app and the controller; you don't need the SOLO itself, and it doesn't need to be turned on, so you can practice anywhere!
The official announcement: https://3dr.com/announcing-the-solo-flight-simulator/