The System said:
It seems 4 years is about the longevity of pool robots. I pivoted from the dolphin models to the Evo Aqua 604 based off recommendations from Marina pool and spas. It looks, operates, and cleans like the dolphin models but has a way better basket setup. I'm hoping it lasts longer, but I will be shocked and impressed if it does.
FTR- It stays in the pool unless we're in the pool.
This has been my experience too. Small sample size though. First dolphin lasted 4 years, with one re3placement. Upgraded to the premier. Works pretty well. A poorly designed part of the plastic frame where the front roller attaches broke after a year. Figured I would have to use the extended Amazon warranty I purchased, but turns out the manufacturer warranty must be 2 years. They replaced the unit and covered shipping.
I think that means I will have a 5 year warranty between the two. So if it dies at year four I might get a few more out of the replacement. Both times I have had claims they just send a refurbished unit.