I agree that Rubber Guard, The Twister and its stuff is just new tools to add to orthodox Brazilian Jiu-Jitsu. Eddie Bravo has mentioned that you have to know your basics. When you have your basics down, then you can add his 10th PJJ techniques into it. The combination of both orthodox and unorthodox (for now) techniques will make you, I would argue, a much tougher people to go up against. For example, you could have someone in regular side mount and starting hunting for a kimura or something. When the bottom person thinks that he/she is OK, then you can transition to a twister side control. I love to mount there. It is so much easier. When people turn into you, you can use the twister roll to take their back. Going back and forth makes you much more dangerous.
I've been training in BJJ for almost 2.5 years now. I use various techniques from Eddie's system. In terms of a top game, I use the twister side control quite often. I typically set guys up from there for the ninja roll. Although the twister itself is a banned submission, the roll itself is an awesome technique to take the back. I'm one of the smaller guys in the gym, so the roll to the back presented itself as a energy conserving technique to take the back. That's my top game thus far.
In terms of my guard game, I have a lot of 10th PJJ influence. My half-guard is almost entirely based off of Eddie's lockdown. The old school sweep and the electric chair sweep/submission have been very high percentage for me. Even if I don't sweep them, I usually start a scramble off that the puts me in a better position (most times). In terms of the rubber guard itself, I use it almost exclusively in my nogi training. In the gi, borrow some of the ideas. Some things I use a lot of, include: the Pump, Invisible collar, the swim move, Meathook to triangle, Teepee and the carni.
More generally though, I believe that Eddie's ideas promote better flexibility that will much benefit, in grain the idea of tightness in jiu jitsu rather than looseness and fostering creativity in jiu jitsu practitioners. It also teaches students a way to put together all the techniques that you learn. Instead of having 1,000 separate techniques, linking together might help a BJJ practitioner remember everything better.
Regarding the Gi/Noqi debate, I personally think that it's important to train both. I know some people say that training the Gi is important for the finest technique. I used to train exclusively in the gi. When I went to do some nogi, there were a lot of set ups that I had that required the gi that no longer existed in nogi. I believe that the gi does not always transition optimally to the nogi game.
I definitely enjoy his school and his techniques even though my only means of RG stuff is through youtube, his occasional canadian seminars and his two books.