We had 3 French Guineas. They were not the smartest birds in the hen house! The chickens ate more bugs than the Guineas. When we got tired of them eating so much feed & making lots of noise (and I don't mean they were good watch birds - 'cause they weren't) we finally butchered them.
We had them for a little more than a year and never got any Guinea eggs. From what I read and frim watching YouTube videos, it seemed (from their squawk) that we had females. Although, when we butchered them, I didn't find any eggs in production.
They had lots of yellow fat (which we rendered for cooking - strong flavor, but good). We knew meat would be tough. And it was! They have all been used for soup - with a long slow simmer in the crock pot). Great game bird flavor! Yummmmy!
Once we had 2 fewer roosters & 3 fewer Guineas, our feed bill went down by half - with 16 remaining laying hens & a turkey hen. I seriously doubt we will be getting any more Guineas!