For using, the principle is similar to microwaveable pouches. The manual says to between 50 to 100g of popcorn into the bowl. There are markers indicating these two traits weight, so no need to leave the balance.
Then you just need to add a spoonful of oil, and optionally sugar or salt according to taste. We replace the lid and left for a few minutes to microwave.
For my part, I have a heavy hand on sugar, 3 minutes are sufficient to 850W and the result is perfect, but the are well blown and sweet.
At the cleaning (appearance still important), this will quickly, silicone cleans very well without going through the dishwasher box.
Lékué provides a small booklet inside that explains the procedures and provides some revenue but not yet tested salty popcorn.
I highly recommend this product.