I've tried Survival Shield and i like it as you take it sublingually and it tastes good, but don't think I'll use it very often due to the price. I bought it before I tried any other Iodine products.
That said, I have now tried in order, J. Crow's 2% Lugol's, Risingsun Nutritional's 5% Lugol's, and just last week received Trapper's 5% Lugol's and SSKI products. I feel that from my short experience, you get the most "bang for the buck" with Trapper's products.