"Advantages of these over Lock & Lock"
This review is for an older version of this product
I have not noticed the problem of the seal not releasing when the box comes out of the freezer but then I would usually thaw out in advance. However, for me the best thing about these boxes (apart from the fact that their "locks" appear very sturdy and strong) is that they are HYGIENIC. With lock & lock, after use you need to keep taking out the seals, washing and drying them and the location where they sit - unless you want to find to your disgust (as I did one day) black mould under the seal. This are much easier to manage - a definite plus for me :-)