The auto empty model. You have to accept they are not as powerful as a corded vacuum. It does work well. They are not maintenance free. You have to clean them once in a while. I got it on a black Friday sale. About $500 IIRC. Sure beats paying over a $1000 for the similar I robot model. The robot vacs are more of a light duty run every day, vs a HD clean once a week. I would give it a 9 out of 10 for a robot vac. 7 out of 10 vs a corded vac.
It you have critter hair the auto empty is the only way to go. Then you can empty the base unit once a week or so.