I love the ones I built, I can carry 3 out into the field over my shoulder and the ducks and recievers, they throw about twice as far as the standard gunners up or zinger winger. I absolutely love the Train-Rite release mechanism I used it works great with electronics and it is actually easier to launch manually than the kicker wingers. Nothing like a winger that will chuck a duck over 60 yards. I can also throw ducks just 10 yards or inbetween lengths, Drawbacks are most men cannot just pull down pouch like they can on Zingers or Gunners up, but must unhook the rubbers first and dogs that bounce of the gunners on marks must actually learn to mark the BIRD not the gunner. The Train-Rite release is also nice because it does not have a servo to fail, and it is very easy to remove primers from if you get one that swells unlike Zingers. The ones I built throw about the same as the $600 Zinger Hunt Tester at about 1/2 the cost.