My S3 was rooted and I was running CM9... It just is not as snappy as the iPhone 4s and the iPhone 5 smokes the 4s. But I miss the customization and the Galaxy Note 2 is coming out and I'm going to purchase it and sell the iPhone 5.
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Any rom within the first few weeks was terrible anyways... CM10 is really the only perfectly stable rom to run on it. After using both the 4s and the S3, the S3 is definitely much faster when used with a proper rom. The iPhone lacks ram and processing power to run what the S3 can run. The Note 2 is gonna be great though, although it suffers identity crisis, I wouldn't know whether to treat it as a tablet or a phone.