The Breda hen is calm, docile, and somewhat timid at the same time. They are rather social, and walk right up to us hoping for treats and pets. But, they can be shy with strangers, and will spook easier then most dual-purpose breeds. In a mixed flock, the hens are low on the pecking order and may get bullied. If bullied, hens tend to be more reserved, and can become skittish.
Hens are good layers of white eggs, and start laying around seven months. We will have to wait and see if they go broody.
The Breda rooster is busy being a chicken, and is not as interactive as the hens. Our boys have not been aggressive with each other, or towards humans. They avoid fighting. We had a few that where rough on the pullets (cockerels) and do not let those roosters stay with the hens.
The rooster averages around 6 pounds (hens around 5), and will make a fine dinner. They do take awhile to put on their weight, so be prepared to wait at least seven months for a decent meal. Even then, they will be smaller.
The breed is very capable of movement. They have long legs and lightweight bodies. They can fly/leap rather high, especially if spooked. However, the normal nature of the bred is to be lazy, so they usually are very easy to confine.
The Breda is a not a big eater, and is actually often picky about what it consumes. They enjoy their chicken feed, but sometimes do not tough their table scraps. They like foraging, but are also happy in confinement. They are not the most cautious foragers, so it would be safest to keep them confined if you have predator troubles.
They are finicky about cleanliness. They do not like to walk in muddy, or wet conditions. In the winter they stay inside their coop, so they can avoid walking in as little as 1/4 inch of show. But, the breed hasn't had any troubles with the cold.
Health-wise, the breed is very easy to keep. We haven't noticed any health ailments. However, occasionally a foot feather fall out (particularly while they are growing) and they will dot blood all over their pen/coop.