Several years ago I bred some hatchery brown Leghorns into my mixed breed flock to boost egg production. I crossed them mainly with Easter eggers and barred Rocks. The EE/Leghorn crosses gave me hens that laid huge pale blue or green eggs every day for months.....they took breaks in the winter but were still giving me 4+ eggs a week at 5 years old. Had to be the Leghorn blood...plain EE don't lay that much or that big an egg IME.
If you're okay with a white egg, I love the brown Leghorns. I personally don't care for white birds, so they were the way to go for me. I did notice they were a touch flightier than my dual purpose birds, but as my flock was free ranged at the time it didn't matter. I never lost one to a predator. Never had one go broody. The roosters were decent guys, good with the hens. The hens don't eat much for how large the egg is. Plus, they're just so perky looking!