If there was any doubt, it's cleared up by this killer film from BJJ Hacks -- Ricardo De La Riva is the man!
I'll be honest, it was not long ago that I, myself, as a black belt with little exposure to the DLR guard/hook, saw it it more as an annoyance than as a tool. Even though it has been around for many years, long before I began training in 1998, I hadn't been exposed to it much. In the past 3 or 4 years, especially with the development of the berimbolo by some of the top pros, the use of the DLR guard has become more and more of a standard bread n' butter intermediate to advanced technique.
As a guard passer by nature, I initially saw it as my job to defeat the DLR and prove to myself that it could not be effective against me. But, that, of course, was missing the point. This is an exceptional guard technique; it's versatile, very smooth (when applied properly) and effective. I've since seen the light and now I'm DLR'ing the sh*t out of people as much as I can. You should too.
We have nothing but praise to give for BJJ Hacks and Hywel Teague for creating this film. They put in the kind of effort truly needed for our art and sport to continue to develop. This little film kicks tons of ass - it has great style and really portrays Master De La Riva as a truly humble, almost unassuming, artist and athlete.