ya i went to my friends military open rolling after his class, and i have never trained, but i was using my rubber guard to hold people who were 50lbs heavier then me of pure muscle, and they were telling me i should work on positioning, but as i went against someone who was a lower belt, and only about 10 lbs heavier i was able to control, submit, and sweep with various positions, and they were still telling me the same thing lol some people believe if you do rubber guard thats all you know, but its just another guard type, that i enjoy the control i get from