I already used the boards to cook my creams in a water bath, they go in the oven etc ... once the lid is screwed cooled and placed in the fridge!
Covers spend month in the dishwasher daily and stickers stand as the first day. I love that they are screwed, it's like suddenly extremely well and is super tight.
The pots seem quite solid, even and excellent quality.
I use the Multicooker Phillips function with yogurt so I can not judge their use with the original Lagrange device.