We have been using these glass storage containers for a few weeks now. I waited to write a review until I saw how they held up with regular use and cleaning and they are great. They really are leak proof which is a huge deal with my large family. Kids in and  out of the fridge knocking things over. They have been knocked on their side and no spilling. I wash them regularly in the dishwasher and they are fine. I have used them in the microwave as well... they come in a variety of sizes and nest together for easy storage.