I took the CX-20 out this morning to exercise my batteries. A couple of months ago I posted a 3D video of the Quanum Nova (rebranded CX-20) in Loiter mode. This is basically the same video, but in 2D, and with the CX-20 rather than the Nova.
I still believe the Cheerson CX-20 is the best value available in "smart" quadcopters. It's a perfect entry-level drone, and leaves plenty of room to grow your skills from beginner to intermediate. It will never be a Pro platform, but it has a bunch of capability out of the box. Because of the Open Source FC and off-the-shelf parts, it's a great tinker platform.