It worked great!

I was off at work during the first "scheduled" run on the Roomba. I came back too late to see whether it had actually gone to work (it was docked and recharged by the time I saw it). But the proof was in the dustbin. Full of dirt and dog hair, I'd say the run was a success.

And, compared to the results from the original brush, I'd have to say the pet brush did a better job holding on to the hair. Transitions from linoleum to carpeted areas were not showing traces of dropped dog hair.