Try "the Pool Cleaner." For years it was marketed throught Jacuzzi as "The Tracker." I was never a fan of Jacuzzi products, but the rep gave me a demo model to try. It turned out to be a great machine. Since Jacuzzi's pool division has been sold and is basically no longer in existence, the original manufacturer has been marketing the cleaner themselves.

I have not had to service any of the ones I have sold in the last 4 or 5 years, but know that parts are available and are much easier to obtain now that Jacuzzi is out of the mix.

Because of their wheel design they climb well and don't get stuck on main-drain covers, especially the 4-wheel model. The suction port doesn't easily clog with debris because of it's design.

All-in-all a great cleaner. No, I don't work for the company, just like to recommend a good product that has worked well for me.