I know some of you don't agree with new tech stuff like having an app do what the plastic E6B does, but reality is that it is faster and easier. Can mistakes be made with it? Yes of course. Can batteries die and you forget how to do the protractor? Yes. But there are similar arguements to be made on the other side, if you have tons of charts and piles of weather read outs will you be able to readily make calculations? No. So like everything there is a give and take. My point being, I am not looking for people to tell me to to carry the old school protractor, I am looking for people who have experience with one of the apps as there seem to be 30 and interested in their feedback on it. Thanks.