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Hi. From my experience the rate is always slightly better than the Coindesk rate or the one Google uses. And they don't deduct any tx fees, so it's pretty good.
That being said, I've seen people (on reddit) complaining about Circle requiring selfie while holding id document, I don't know whether it's true, I was never asked for such. But I'm in UK, so maybe verification requirements are different between the countries or even between states.