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Im good. Thanks for asking.
There is always a bit of confusion on this matter. The Leghorn is considered the top egg producing breed across the board. All commercial egg breeds are based on it, for good reason.
However, they are flighty, high strung and tend to be harder to deal with in the casual backyard flock. Consistency is often an issue with them. Flatly put, they don't always make the best egg layers in the 'yard confetti' flock.
That is where the dual pupose hybrids have come into play. They are usually a cross of one of the Reds and/or BR's. The ISA Browns you mention, Cinnamon Queens, Red Stars and so on fall into this category. They are more docile and have the advantage of hybrid vigor, and so tend to be less influenced by disturbances in their environment. They often produce more consistently than other breeds, although this diminishes in suceeding generations as the hybrid genetics water down.
It should also be said here - with the best intentions, of course - that most BYC'ers don't keep good records nor maintain rigid selection practices. They tend to work with small yard flocks and often go with their 'gut' when commenting about their flocks' egg laying capacity. As much fun as it is to talk chickens here, such information has to be regarded as anecdotal.
Much the same can be said for advertsiing hype put out by hatcheries.
This doesn't mean that the hybrid breeds do not produce - au contraire! With proper care, they are capable of some good production, but it should be remembered that they are hybrids. Suceeding generations will fall off unless careful selection and "re-blooding" is practiced.
Just for the record, something closer to 200 eggs/year has always been considered a very good norm for the single, casual flock. Getting more requires special management over a long period of time.
