I was flipping through an archery catalog, and saw a product called turbo nock. See picture below. They claim a conventional arrow takes up to 20 feet to make one full revolution. The turbo nock makes two full revolutions in the first five feet. At 200 fps the turbo nock spins 4800 rpm. It says this high rate of spin enables it to group better and have a flatter trajectory. And it will drift less in cross winds. Has anyone used these? Do they work, or are they a gimmick?