I bought the smaller set a few weeks agao and so far, I'm impressed. I generaly hate plastic storage ware because they retain smells and really hold on to grease (there's a scientific reason for this ... plastics are made from petroleum, and generally speaking, oil attracts oil). This probably isn't a problem if you have a dishwasher, but we hand wash and it often takes 2-3 scrubbings and rinses to clean a container. Well, these are surprisingly easy to clean and don't seem to retain odors as much. One container still smelled like garlic after scrubbing but the smells dissipated after a few days (don't cover). And they definitely don't discolor because of food, i.e. tomato sauce. And the locks prevent the broken nails I used to get from opening cheaper containers. So far, I'm impressed.