I find your premier set is just what I needed. I can relate to the other comments, a few of my container cracked and broke, some are half way cracked but I still use them for dry food instead of wet food. Sometime, I wish I can just buy a replacement containers without the lids, because i have so many lids since bottom containers cracked and no usable any more and I had to discard them.
I don't have problems with the lids, although sometimes I get dried stuff on it, so I soak them to loosen it up then clean it, it works well, however sometimes I wish I have a brush to use that fits well so I can clean immediately instead of waiting.
Do you have replacement containers, my lids are in very good shape, no cracks , I have used them on microwave ( once or twice only, since I don't like using microwave, only once in a while a work, if needed).
I have soak my containers in a small amount of Clorox to remove some tomato stains, I hope that is ok.