Lionel Mullin has been a Certified Scrum Master since September 2010. My background is traditional waterfall methodologies like Prince2 and MSP.
I've been using a tailored version of Scrum in enterprise environments for over 2 years and a very traditional version of Scrum for one. However, from a project managment standpoint, I'm investigating DSDM as a more suitable framework for managing projects with the necessary governance. The beauty of DSDM is that it works seamlessly with the developement orientated Scrum methodology.