I wanted to add white eggs to my colored egg basket so was looking for some non flighty hens to get along in the dual purpose mostly heritage breed flock I have. So many of the white egg layers are described as "flighty" I read about and was interested in California Greys but they certainly are not the easiest breed to find so they went on the back burner and I almost got another.
Then this spring I was able to order several. Sizewise they're the smallest of our large fowl, being the same size or some are slightly smaller than our Easter eggers, our smallest breed. They're friendly and they forage well.
We have coops with covered runs but do let the chickens forage inside a fenced in area. The other chickens all stay within the fenced in area but the California Greys can easily fly the fence, but also come back in and can reach the high roofs on the coops.
They may not be practical for urban or suburban chicken fanciers unless kept in covered runs or their wings kept clipped, but they do stay nearby. If they go over the fence, they come back. They tend to leave our garden and flower beds alone (Don't know if this is a breed characteristic, but I appreciate it.)
And while friendly to us and they easily tolerate our dogs running around them, they are very aware of their surroundings (wary) so may be an excellent choice for someone who wants to free range.
Recently my husband announced that if we want more hens next year without hatching our own and we want sexed ones we should get more California greys. Considering the number of breeds we have and could choose from, this is quite a complement.
Added later: Now that our California Greys are laying, they are little egg machines. I want to say they've never skipped a day since they started. While other breeds take a break, the CG's just keep going.
I have noticed their egg shells are slightly thinner than my heritage breed egg shells (But still much better than store bought egg shells) and I did read that because they lay so many eggs this could happen so I do keep a bowl of calcium out in addition to their feed. already have an order in for some more for this spring.
They aren't the easiest breed to find, but if you can, they are well worth it.