if you're new, and you try rubber guard during live rolling, you're allowing me to do a move that i like to call: free pass to side control.
if you're new, learn the basics. as someone mentioned earlier, learn to move your hips, learn the proper way to retain, or recompose guard using hip movement and technique. pay attention to shrimping forwards and backwards. if you have abnormally flexible legs and knees, and you have a good grasp of what it means to play closed, open, and half guard after months of training, even years, then by all means go ahead and learn whatever you want including what eddie bravo teaches. just don't start with it.
btw here's a reason to not start with something like the lockdown as a beginner. i've never liked lockdown because you can't play a good half guard game with it imo. it does 1 of 2 things. 1) the position itself forces you on your back. this at least for me go against the basic tenets of playing a good bottom half guard game: don't go on your back. play on your side. bottom half at least for me allows for many ways to not only recompose guard, but many great sweeps and subs, all of which require being on your side and all of which are nullified by going for the lockdown. 2) it makes you play a defensive game where you are just delaying the inevitable pass. when i play bottom half, i'm going with either a knee shield or playing half tucked into a ball so that i can transition into deep half, but i'm not going on my back.
anyway, i'm not against 10th planet, i just think that you can't live and die with it. it needs to be implemented as part of a larger and move diverse game. i personally am a big fan of denny prokopos, a 10th planet black belt who has a school in sf. to each his own!