Vimeo user Kevin Conder, did a very detailed 9 part video review on the Birdycam 2 gimbal. He literally goes from beginning to end on what you need to know about the Birdycam 2 and even takes it out on a few test runs.
Check out part 1 "Introduction and Overview" below.
Be sure to check out all 9 videos here - http://vimeopro.com/kevinconder/gear-review-the-varavon-birdycam
Part 1: Introduction and Overview
Part 2: Balancing
Part 3: Useage
Part 4: Life on the PID - Computer
Part 5: Birdy-PID and Control By Phone
Part 6: Birdy on steadicam
Part 7: Test track
Part 8: GH2 BMCC tests
Part 9: Verdict
Click below for more information on the Birdycam 2.