Oh, how I missed her! But while I waited for my refund (yes,Amazon gave me back every penny, and paid for the return shipping), I did quite a bit of research.
I had a Roomba for years, but she really got to be too expensive to keep going, and I finally sent her to the heap. The 780 was much nicer, bigger bin, could run longer between charges. However, cleaning her up was just as big a pain as it was on my old 500 series. I have the world's hairiest dog, and even with the special tools that came with the newer model, it took a looooooooooooong time to remove hair from dust bin, both rollers, bearing housings and wheels.
I did a lot of research before replacing her, and Monday my new Rhianna, the 880 model arrived. I ran her for the first time yesterday, and I am very pleased. There are no brushes, and I was leery of how well she would take up the dog hairs. She did. No brush to clean. Okay, the jury is still out, but as of today, I am very happy with this newer model. I just came home from a forty-five minute trip to pick up my Mantis roto-tiller (that's another story for another day), and she had cleaned the whole living room floor and was safely back in her docking station.
Looks like perhaps Rhianna II and I are going to become new best friends.