I purchased an 18ct set of these storage bowls 2 weeks ago, and although they look great, there are concerns to be had regarding the quality. A couple of my bowls looked as though they were cracked after one use in the microwave. This is disappointing, since I was looking to replace my traditional Tupperware with these.  I haven’t used these in the freezer and I don’t intend to. So far, I can attest to them being leak-proof, but microwave safe is questionable.