I'll put it this way; if I had 4 boys and 3 dogs already, I'd not want an Aussie. They need loads of attention, behavior training and might try to herd the kiddies around and are known to nip at kids' feet and the kids don't like it. They love their families but can be testy towards company and kids friends, should they come over to play with the kids. If my son had a friend over, for instance, we'd have to keep our old Aussie in another room, as she couldn't be trusted with people outside of the family. Aussies are good watchdoogs and guarddogs but they could annoy strangers and visitors, not all of them, but some. They are herding dogs so, although it's normal for a herding dog, the nipping can be hard to stop and the kids get annoyed with it.
I have a 4 month old Aussie and he is just like having a 3 year old on my hands. Always into everything and a bundle of energy. After about a year, he will settle into being a wonderful pet but it takes my energy all day to keep this "baby" in tow and train him into being a good adult dog.