I have officially started doing real 2a. Yes, two hands looping simultaneously. It is a really cool and unique feeling when you get both hands going. Every yo-yoer needs to try this. Unfortunately, the time commitment, I have two months in this, keeps most away from this great style.
I am getting a little bored with just doing inside and outside loops now. I was going to learn Tangler to help cure that boredom, but that brought its own problems. When I tried to do Tangler I was met with a yo-yo to the face. Now I am getting into the 2a pain.
I did around two-hundred loops with each hand by themselves not to long ago.
I can do about five loops with both hands simultaneously.