Generally there are two types.
Providers who keep their eyes closed the whole time or nearly the whole time. Makes you wonder what they are thinking about while you are engaged with them. Laundry list, shopping list, composing their next advertisement. What I am thinking when this is happening is that I can get this type of action from my wife.
And then there are the ones who keep their eyes open and actually show some expression and are connected to the session. There is usually some verbalization as well. These sessions usually have some back and forth feedback. It really makes a big differencs in the enjoyment level.