All hens are different. One flock loves them and keeps them clean, another flock tears them up. Feces and debris tend to fall through keeping the eggs clean and there's little contact area so the bloom doesn't stick to the bedding much.
I use pine shavings, with a rubber mat underneath that's easy to clean. Been working great for my gals. I use about 8" layer and they have set both boxes with a nice shallow "nest" and bermed walls all around. I never have dirty eggs and only clean out the shavings once a month. I've only once found bird droppings in the nest box.
We use pine shavings. There is rarely poo in there and we've never had a broken egg either. We get it pretty cheap and don't have to clean it too often. Of course, our hens (and we only have two) share the same nesting box. I'm worried what they'll do when we set up their new coop in a few days...anyone know if we'll need to retrain them to the new nesting box location or is this something'll they'll sort out on their own? I guess we'll wait and see...I have a golf ball on hand just in case they're having a hard time with the move