Very cool - not worth the $$$$ in my world. Like
@JParrott, I can easily dump cubes, walk around and spray them.
That said, I've been doing an experiment this year. Tried Ultra Boss last year (the original & Grit's recipe), always used Fly Ban in the past and tried Clean Up II in May of this year. None of them are effective more than 10 days in heavy fly season and nothing will keep the evil horse flies off (precisely why I keep a couple fly swatters in my Polaris). Ordered more Fly Ban for the last part of July/early Aug. Sprayed again yesterday and half the herd got Fly Ban, the other half got plain ol' 10% permethrin from the Co-Op mixed with canola oil. Only been a day, but essentially no flies on either group, will keep track for the next 1-2 weeks. If there's not a significant difference with the Fly Ban group, I see no reason to spend 4x's as much. Will have to let you know . . . .