Green tails don't look or feel nearly as nice as tanned tails. Plus, the green ones will still have all the scales on them...at least for a little while. If you have a nice bow, put a nice tail on it. I will buy or trade you tanned tails for green ones. The value of a green tail depends on what you have done to it and size.
This goes for anyone.
They can be a little tricky to install, especially if they aren't done rite. No, they are not very pliable and if they aren't skived down thin enough, they won't work for anything curvier than a straight grip.
I have installed beaver tails on some of the craziest recurve grips and thousands on longbows. There is certainly a learning curve, but they are worth all the fuss. Won't tear nearly as easy if they are tanned.
thanks, bigjim