RE: Goose Magnets
We have 3 of them and stopped using them 2 years ago. I like them, but the other guys in our group don't. I still see some pretty hardcore guys using them (including the group we hunted with last weekend).
In summary, I like them - but know a lot of guys who don't. I think it's a similar question to "should you turn the robo-duck off as the geese are approaching" - some say yes, some no.