Chopper has worked great on turkey feathers. What I quickly realized was the better feather cuts were based on how well the feather was prepared for the chop. I have a lot of scrap stuff laying around, so I took two pieces of thin metal and some wood and made a feather clamp to grind the base and sides. 3 Rivers sells one similar to what I made. I also use a table drill with a round grinder attached. Like I said the chopper works well, but getting the feather ground was the most trouble to get correct and I am still working it out. Just takes a few seconds to grind a feather.
Something that I noticed is when I chop the right wing feather I lay the underside of the feather up. If I want to chop a left wing feather I put the underside down, but both facing in the same direction. Seems to work okay, but I only have a right wing fletcher.
Good Luck