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I'm enjoying a mixed bag of chickens. I have a few that won't lay much, but will lay "prettier" eggs (Marans, EE, Ameraucana, Olive Egger), some standard heritage breeds that will be decent layers (BO started 3 weeks ago, and is laying large eggs every day) and some hybrids to really produce well (BSL and California White). My Blue Wyandottes are pure eye candy, but are giving me 3 eggs a week as well.
I believe I've read that the hybrids will tend to "burn out" quicker than the heritage breeds. Since I have no intention of culling my girls after they stop laying, I'm happy if they are decent layers for 4-5 years rather than being exceptional layers for 2-3 years.
I'd say unless you are feeding a large family, or going into the egg business, mix it up!