These were great at the beginning but towards the end (5 months later) I ended up throwing them out. I did learn a few things along the way though...
1. The vent holes are not big enough to vent the built up steam and as a result the lid will warp. I even once had the lid pop off.
2. Even if you pull the lid off and lay it on top to stop any splashing from the food (say spaghetti) the lid still warped.
3. The lid will eventually crack near the rubber seal and eventually separate from the lid. This is cause for concern because it is no longer air tight and I wonder what will grow within those cracks.

I usually love Rubbermaid products. I use the premier line and I love it. However, the brilliance line needs to go back to the drawing board.