I was visiting a breeder couple years ago and all of their chicks were on weld mesh so the mess dropped through the holes and could be swept away. Figured I'd move to this eventually but it's not cheap for the good thick stuff (much thicker than chicken wire!) so this has gone on hold. I liked that they can't scratch about in it and pick at bits of dried poop and stuff, all their feeding efforts are focused on actual food.
At the moment I use cardboard with a layer of sawdust, and for first couple of days, with a layer of paper towel over it while they find their feet.
I don't like cardboard much, if there's not enough shavings on top it's too smooth and slippery. It absorbs moisture and goes soft or mouldy if I spill a drinker or something. Maybe corrugated cardboard is better.