>I've tried a couple of different Roombas. They simply don't work very well.

Your experience is much different from mine. I bought a Roomba, then bought another Roomba, because I realized I needed Roomba redundancy.

Could not imagine life without Roomba!

I don't have carpet and no rugs. On hard surfaces I find Roomba does a better job then manually sweeping. But maybe different with carpet.