Pros: Excellent year-round layers, usually quiet
Cons: Nervous, shy personalities
We added 8 Khaki Campbells (hatchery quality) to our mixed flock about two years ago. Although they can be bribed with defrosted frozen peas, they generally prefer to keep to themselves, and become excited when humans approach them. We're planning to replace them with Welsh Harlequins when their laying careers are over.
Their eggs are about USDA Large to XLarge size, which makes it easy to substitute for chicken eggs in recipes. We found their meat very tasty, what little of it there is.
They are low maintenance as adults, and have done well in our high desert climate with temps from 15 F to 100 F. Here they are enjoying the monsoon rains last year: