Redhead and Pursuit I have not had good luck with , they were fine for a couple months then either broke or fogged over.
Same goes for low end Bushnell.
The Redfield we had purchased in 1974 was still spot on in 2011 when it was retired from 30-30 action.
If it was not for the scratches on the glass it would still be in service. Not a top 10 but one tough scope.
Scopes today are crystal clear compared to that old relic. 30+ years and never loose zero with multiple 4 foot drop tests, and rain snow and mud tests.
Redfield is now owned and mfg by Leupold. I have had a couple of the old Redfields and one new one. They are top notch in my book!