I dont write articles, dont do product testing, buuuut, it seems to me that one would anticipate questions that potential users might ask. The better one is at anticipating such issues, the better the review.
Just looking at the pics I have some immediate observations/questions that would prevent me from purchasing this product;
1. The ones with snap-on lids seem to have a slot that the lid snaps over/into. This seems like a bad idea for food to get into and be unable, or at least difficult, to clean. A better design would have eliminated the outer half of that seal so there is no slot for things to fester in, or reverse the seal geometry to accomplish same.
2. When stacked in the fridge, as in pic, I see poor space efficiency because the bowl is cone shaped rather than straight-walled. I would not recommend using in the fashion due to poor space management. Snapware is much better for stacking and sealing items for fridge storage.
3. I am curious as to just how sturdy these are, vertically. How well do they resist squashing down? I know similar bowls will snap down unless you are careful not to press on the wall. It could be messy if they are liquid filled and the decide to collapse. Similar concerns with stacking (fridge).