Automatic Pool Cleaner Under $550

I'd recommend the Dolphin E10/Active 10/S50 models. They are all the same. They don't do walls but otherwise meet your requirement.

New looks like $450 or refurb for $399.
 
I'm on my third year for Hayward Sharkvac...https://www.amazon.com/Hayward-RC9740CUB-SharkVac-Robotic-Automatic/dp/B019C98ALA/ref=sr_1_1?s=lawn-garden&ie=UTF8&qid=1526408648&sr=1-1&keywords=hayward+sharkvac

No complaints at all. It does not climb walls regularly. Sometimes it does and it remembers that it's only a $500 cleaner and quickly comes back down before getting into trouble by Hayward. Seriously, I think the only difference between this model and one that climbs walls is in the software programming or power module.
 
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