How effective do you truly believe they are? I have almost always traded hunts with people for snows and have never really had my own snow goose spread. I have a couple hundred silo socks but nothing crazy, always just enough to add to the spread so I could contribute in some way. Long story short, my family owns a field in a VERY high volume area for snow geese. A buddy and I are combining spreads to set up and leave out all season. We don't expect huge days or consistent success but an occasional 20-30 bird day between 4 guys is what we're after. He has several hundred silo-socks and an e-caller. Is it worth the effort and money to run a few rotary machines? Do they really add to the effectiveness of the spread? I don't know if it could be akin to mojos in duck hunting? I only use mojos 2-3 times per season anymore and I'm unsure if it even mattered the times I did. TL;DR - Are rotary machines worth it when it comes to snow goose hunting?