This year I switched from being a thumb only (TO) pilot to being a thumb and fore finger pilot (TFF). It wasn't hard as I spent some time in G2 getting used to the new grip. I also think that a neck strap or a transmitter tray is needed for the TTF grip as you have two fewer fingers holding onto the transmitter... Now that I've switched I would never go back. I am much smoother, much more precise, and can make and hold much smaller control inputs.

I have found that about 40% expo work best with my new TFF grip. I think TO pilots use a lot more expo. Recently one of the best TO pilots at my field helped me setup my latest plane. He had so much expo in there that I didn't like it and I ended up taking most of it out.

I have not found that I cannot move the sticks as fast since becoming a TFF pilot...