I can't help you with the Calypso, but my Rhea took about 100 hours or so before it really started to sound it's best. I've heard the Io in a system I'm familiar with and I'd have to say that the Rhea gives me nearly identical performance. If you don't buy it now I'm pretty sure you'll return to it later. It is an amazing phono stage once you've given it time to break in.
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