We sold a lot of the 9300 when they first hit market and absolutely loved them. Unfortunately, we were met with bad results come the 2nd and 3rd year of use. The design and usability is great, however the quality of it, or maybe it's just the way it works, doesn't seem to live up to the Polaris name. When looking at robotics, the two major quality names are Dolphin and Aquabot.