i have a refield widefield 3-9 power on my stw ..... it works very well for me .
my feeling is , if i need more scope to shoot something , the animal is so far away it will not notice me sneaking up on it to get closer to get a better shot .
you also have to pack the weight of a larger scope ....... it might not seem to bad after 20 minutes ... after several hours a couple extra ounces of weight seem to multply by at least 100 .