I got my trio in the summer and have very few complaints. Unfortunately, they aren't as social as I would have liked, but that is the worst I have to say about them. Calls are very enjoyable and tiny. They're quite loud though, as previously mentioned by others, and I can hear them from inside my house. Only the females are loud. The males don't make much of a noise above a whispery-rasp and from what I've heard, the breed is fairly friendly as a whole.
Eggs are small and are supposed to give off a green/bluish tint (mine are too young to lay eggs). As said before, higher quality Calls are smaller than lesser quality ones and have a harder time pipping their shell. The better quality ones have shorter-stubby bills, and that makes it hard for them to break out.
Calls fly very well, too. They can be pretty high in the air and sustain being air-bound for a few seconds. They also love swimming. Minus their size, they're very much like many other breeds of duck.