Good, but I don't use the cartridges
I have an older litter locker. It's sturdy and works well, though I never used the feeble scoop. I didn't much like the pull through cartridge system, which wasted a lot of plastic, what with tying knots. After it ran out, I started using regular bin bags. I cut the end off one to go under the rim, so waste if directed down into the body. An intact bag just goes into the main compartment, with its rim folded over the top of the compartment, like you'd do with any other bin.