I've only heard of Rios from a friend of mine who does a lot with fish tanks. He's had them freeze up for no reason before, after months of running just fine. When they freeze up, they burn themselves out, and heat up the water like crazy.
Still, if you're using monitoring software or happen to have a board that does the temp monitoring/shutdown for you, it shouldn't be too bad.
You just have to weigh the tradeoffs I guess. My Danner pump was less than $30 (though I might've done some coupon-trickery to get it...).
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