The lid will pry open a bit from the pressure of the steam, but it hasn't negatively impacted how they cook.

Although the lid is a little bit loose after several uses, it is no big deal

Pops open in microwave even when I make sure the lid is shut and secure.

Lid keepd opening causing a huge mess in my microwave

The lid doesn't stay closed and eggs can and will explode and blow the top off, covering your microwave in egg goo.

1st time the lid was not snapped shut and it blew open making a mess in the microwave and the eggs were over cooked

so its not a good seal and tends to be messy and egg doesn't cook as well as i like