I'm not, but I might have to do it in the Spring even though I think it's really stupid in NY. I looked into it because technically to ship hatching eggs you are supposed to be NPIP, and you definitely are if you're shipping live birds.
However, it's a joke in this state. Thankfully it costs nothing to do, but they don't test for anything useful - just one strain of salmonella that I already know my birds don't have because if they did with the amount I handle them I'd be sick already. They don't test for anything useful like mycoplasma, coryza, not even the avian flu. Just one strain of salmonella.
And they don't test waterfowl - at all. Waterfowl, the biggest vector of disease, are just not tested. I was told this when I inquired about it. If you have chickens and if they test clean, they assume that the waterfowl are clean too. I would assume if your whole flock is waterfowl they'd test, but maybe they wouldn't and you'd just be ineligible for NPIP.
Plus you are now restricted from getting any birds or eggs from anyone else that isn't NPIP. If they find out you did, you lose your certification. Although really, no one is checking. If you buy from someone who is NPIP they could have broken the rules, rendering all the testing that was done on their flock null, and no one is checking and there's no way for you to know.
Plus, the whole reason that this program exists, so that people can't sell birds and hatching eggs that might not be disease free and aren't supposed to ship them, isn't even enforced. Never once has anyone at the PO questioned me on shipping eggs. I don't think they even know the program exists.