Most reviews I have seen concur with this video. Little to no difference at 20% the cost of the originals.
I shot a chinadermic. All shots flew straight, deployed on my 1/2 gallon milk jug (filled with water) every time, and had no problem getting pass thru on a fairly thick phone book. Shot the same head probably 6 times all with the same shock collar too. I know not the most scientific experiment, but just my 2 cents.
Great review. Thanks for showing the weight difference. That always had me curious how close to advertised weight they are.