I have used a number of pollen traps and have found that the Sundance works the best for me. I prefer to put them on as a top entrance it saves me having to bend down to empty them. You will have to inspect them regularly as they can fill quite quickly, twice a week works for me. Don't worry about the bees not getting enough pollen as the trap won't take it all. I never run mine during a dearth, running them in spring and early fall to catch some of the goldenrod and aster pollen. Sometimes bees will get trapped between the scenes, just a few so nothing to worry about.