I leave the caddy on my counter. I use it while I prep dinners etc. so I can toss all the scraps from chopping up ingredients. The lid isn’t a tight seal, so it can attract fruit flies if you don’t dump after every use. I usually dump it every 1-2 days max.
I like the look. Don't think I can attach it to my trash can as the Simple Human I have has a black rim around the opening which makes that area slightly bulkier. I tried the included magnetic attachment on the rim and it doesn't lay flat against the can and I didn't want to force it so I don't think I'll be using the hanging device.
I love this compost caddy—we have long used extra mixing bowls to put food waste as we're prepping, This is an elegant solution that doesn't create yet another dish to be washed. And the fact that it docks to the side of the trashcan, makes it one of my favorite purchases for our kitchen.