I studied with Sande Shurin briefly last year. It was a great experience for me. (again, this can be different based on individual's experience, skill level, and compatibility with the technique)
Based on my experience, I would say that the technique focuses on the actor him/herself, using the raw emotion present at the time and utilize it in the scene work, instead of 'being' the character of the scene.
Sande talks alot about energy, our breath, our body. The excercises that we do are mainly discoverying and understanding what our current emotion is. Define it, and then use it.
The students were asked to jump right into the scene witout any pre-time (yeah, no repetition), no nothing.
I find this technique extremely helpful to me when I do monologues. Doesn't matter if I was nervous or terrified, I was able to channel that energy into my monologue work, and everything would work to the end.
But there are alot more to the technique than what I know. I did not enroll in her advanced on-going scene study class due to schedule conflict.
I don't think the technique would work for anyone. And those who have not studied traditional techniques (Uta Hagen, Method, Stella Adler and Mesiner) might be able to 'tab' into Sande's technique faster.
I would recommend you to get her book. (You can get used copies on Amazon.com or any other online stores)
Good Luck