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Their 0.2 minimum payout is absurd though. OPs three 580's will take eons to get payouts.I've been using Nanopool. They seem legit enough, and I'm getting consistent payouts. Not sure how they compare to others, they were the first one I tried.
https://nanopool.org/
The default is 0.2 for minimum payout, but you can adjust it as low as 0.05.