In the aftermath of Metamoris 3 and Eddie Bravo effectively using the lockdown, all of us who get on the mats on a regular basis are going to need a refresher on this. Lockdown videos and instructional are likely blowing up and many a grappler is going to be taking it for a spin in the next few weeks.
Teaching today's advanced class is Ralph Gracie black belt and former pro MMA fighter Kurt Osiander. For those of you who don't know, Kurt turns out weekly moves on the Ralph Gracie youtube channel and is one of the best video makers out there because you laugh and learn all at the same time.
As Kurt says in the video, the lockdown can be used for stalling but is also a legitimate position with many sweep options, so having a counter to it is a must for a good top player. Hopefully this helps.