my brother has had a simmons 8 piont 3-9x32 scope on his marlin 30-30 for about 6 yrs and has never had any problems with it. or had to re zero it in. it is always right on the money year after year. i have tried to buy him a beter scope but he said dont wast the money he is not changing scopes. so they must not all be junk. i also hade a simmons 3-9x32 on my 30-30 for the 3 yrs i owned the rifle and never had a problem with it.