I bought one of the very first PoolBusters years ago. Quickly battery life got too short. After 2 years I called them and they sent me the replacement battery and motor pack for about$75. Since then, at least 3 years, it's been fine and easily runs an hour at a time. They just seem to get bad batteries from time to time and you need to catch it while it's still under warranty. I have a 16x40 rectangular pool with a 5.5' deep end. I bought the extrafine reusable filter bag and it works GREAT!

That's my experience.