I love the Shark ION over the supposed smart one (IQ). It bumps around, changes directions randomly and ends up cleaning everything. Best of all, you don't have to worry about messing up its memory. You just pick it up and put it where you want it to go. My mother in law has the IQ smart one and it refuses to go to certain rooms, but when we pick it up and force it to go there, it then forgets about the other rooms. My regular ION robot is truly pick it up and put it where you want. Shut the door if you don't want it to go somewhere, and when it's ready to dock, just stick it back without worrying about messing up any "memory." Works great and my wood floors are always clean.