I have them. I had to adjust my sight a bit. They will add enough weight to cause your arrow to drop more quickly. I just adjusted my entire sight a hair and was dead on at 20-30-40. No need to adjust individual pins.

It's like shooting a lazer. It's really that neat. I had a bad one from the factory and they replaced it no questions....great customer service. Great product. I don't know why anyone would hunt without them!