The atomisers has a DOA (defective on arrival) guarantee. It should, for example, obviously work when you receive it but after that there are no more guarantees. You should always try the mizer as soon as you receive it.
You must be aware that it is a perishable consumer product, and the durability depends highly on how you use it. Therefore, you must test the mizer when you receive it.
The various tanks in different plastic materials may not be compatible with different liquids. Since there are countless varieties as well as different sizes, Pink Mule does not guarantee the possible breaking of the tank due to liquids. You can follow the forums for vapers where people exchanges their experiences or have a look on Pink Mule's tank killer list of some of the more famous "tank-killers".