i bought the 10 piece set because it was rubbermaid and clear. I have had them aprox. 3 months, there is a bubbling on the large & both mediums, 1 small has some slight cracking. I really like the clear & square design. decided i would not use them in the micro so much and they would be ok. have not been able to find any other containers like them, I bought another 10 piece set a few weeks ago, did not open it until yesterday.  it is missing 1 lockdown from the medium, and the store will not take back because i lost my receipt and i cannot find a replacement lockdown on line.