I like my navigator on my pebble finish. It cleans the bottom and sides very well. I have found that it's sensitive to flow rate, not enough and it won't climb the walls. Too much and it can go up onto the baja shelf. I have a manual valve at the pump to control how much suction goes to the cleaner and this works well. I have had it for 1 year and the shoes are getting close to needing to be replaced. I haven't had any problems with it. In the year I have had it perhaps I had to lift it out of the pool two or three times total to clear a rock.

-- john