Have been using this line of round and rectangular bowls for over a year now. This is our third set 'cuz we just like 'em and use 'em a lot. They don't break easily, as expected from Pyrex. I did drop one on ceramic tile floors and it made a gazillion-and-a-half shards. The rubbery plastic lids are sturdy and tight, stay tight, and don't get brittle from use in the fridge and freezer, at least not yet. We don't have a dishwasher. We avoid using the lids in the microwave in case they'd get brittle from that (it happened to our similar Corningware lids, and I bet these would start to crack too if we nuked 'em regularly). You can nest the different sizes together but the same-sized bowls don't stack compactly, so they might take up some space in your cabinets, compared to some of those plastic stackables, but who would want their food stored in plastic?