Pros: Lovely olive eggs in the basket and typically high productivity. My girl is very heat tolerant in my mild winter/searing hot summer Zone 9B climate. She is also one of my very quietest.
Cons: Unknown breed parents for their cross. Any Chocolate or Light Brown Egger with any Blue Egger will do! So feathering, temperament and climate durability are highly varied also.
Hard to tell what you'll get with a cross-bred chicken like the Olive Eggers unless you know the specific parents or even parentage breeds! My "Livvie" appears to be Crested Cream Legbar (blue) crossed with a Plymouth Barred Rock (brown)??? She's just turning two, a teensy bit flighty and decided to go broody! I might try to use her to raise me a rooster for them, plus 2 more girls to my current healthy mixed Heritage & Cross 8???
ChickenMath!