Transition From Strong Side to Weak Side---The Bump--Anyone Use or Try It?

In practicing transitions from strong to weak side this video appeared (Garand Thumb) demonstrating an alternative method, the bump. Go to minute 10.45 of this video where he demonstrates.

https://www.youtube.com/watch?v=EMJclRDkML0

This is very easy and quick for me. Anyone else? Downsides???