I had got the magnock system and tried it also. I found the arrow flight to be good, but both of my receivers blew up after about 100 shots. I mean I couldn't even find pieces. So I went back to regular nocks.
time marches on: One day I get a letter in the mail telling me I could upgrade my receivers ect ect. so I email magnock man and explain I have nothing to sent in as both receivers blew up.

About a week later I get two new recievers in the mail with some new inserts for the arrows. A letter explaining that they had a problem with some receivers and I must have gotten some bad ones.

So Now I guess I'll give them another try on my target set up. As I too found out that they do help in the accuracy department...

So Magnock is a company that will stand behind thier product. No complaints with the coustomer service. Rated 5 stars!!!