Which automatic pool cleaners other than Polaris are efficient and durable and recommended?

Your traditional automatic pool floor cleaners are not bad however they only clean the bottom of the pool and do nothing to keep the water clean. You mention the Polaris pool cleaner, these are considered the rolls Royce of pool cleaners. The problem with them is that they only catch big materials and blow the fine stuff back into the water to settle on steps and other surfaces where it cant reach. For an automatic pool cleaner that stops the water from getting dirty in the first place and sanitizes the the surface of the water where the greatest risk to health is have a look at the Dragonfly Super Skimmer.It has one moving part that is highly unlikely to wear out during its 4 year warranty. Check out dragonfly.biz