Yes, this is why my Roomba doesn't get much use anymore in our house. There's always a loose toy somewhere. We have to have the kids pick up all the toys first before we can vacuum. At that point we end up using a Miele canister vac instead. We can see what we're about to vacuum up. It ended up being the better purchase over the Roomba.

I don't usually let it go in the kids room unless it's right after they've cleaned. The main problem areas in the apartment are right in front of the door, where they take off their shoes (so much sand, always!) and under the kitchen table. And from my messes: in the kitchen, from cooking. Those are the areas I was vacuuming most days by hand before. Again, the main problematic things for me are dragging around cables (from my stereo) and moving rugs, but those aren't more than a few seconds to put back. It gets stuck on something else maybe every 2-3 runs.