What is my personal opinion about stem cells therapy?

Stem cells:
I think that the 90% about stem cells is good, but the other part is bad. What is it good about the stem cells? They can change into any kind of cells like: branching cells, round cells, and flat cells, etc. And also they can make all the functions. To sum up they can heal most of the diseases we can get. But they are also bad because probably a friend, or anybody I am with, could pass me his or her stem cells, but if he or she had a disease like: Parkinson, cancer, AIDS, Alzheimer, etc, the most possible risk is that I get the disease.

However, let's suppose I have cancer and one of the solutions is to take stem cells from embryos. I will accept it because if a woman donates the embryos, is because she doesn't want a baby, so if I don't accept, her family wouldn’t be able to take a good care of the little baby. But honestly I will prefer other cure.