All the Redfields are fully multi-coated, nitrogen purged, waterproof, and shock tested. If you don't mind the 1" tube, it's a quality scope.
Some people prefer 30mm tube diameter because it helps with light transmission, but with a 52mm objective, I don't think that will be a problem. It is really only a consideration if you're out in the woods before dawn every day, and until after dusk.
I haven't personally looked through this scope, but on paper it seems well worth the price.
There can be too much of a good thing with antler rattling.
I like to hit the horns together for a good 30- to 40-second rattling sequence and then hang them up and resist the urge to hit them again.
This works to the hunter's advantage, because if a buck has heard it, he may have been 300 or 400 yards away and he comes in and he's not exactly sure where it came from.
When finally is time to rattle again throw a slight change-up into the routine.
The second time, don't rattle as loud...