If he's not on a Linux host that can run Docker to start with, its not going to be faster, and its adding complexity.
I check back in about once every two months to see if there have been any breakthroughs.
I wish the Docker team hadn't more or less given up with boot2docker, since it completely abandons the vagrant advantage of a folder shared with the OS. People do wierd shit like trying to mount their OSX home dir over NFS and, well, Vagrant solved this a long time ago.