All my Customers love the clear ones.
I have used the Ovetherm from EggCartons.com and have never had any break 2 years now. The paper one are good for a couple times but look bad after people bring them back after cooking next to them and spots on them from broken eggs
I sell them as fast as the hens can lay them. I have had some customes bringing the same clear cartoms back for about 1 year. The snap locks still work great.