1. I purchased 2 humidifiers and accessories. They only take up 2/3 of the entire shipping box, and the remaining space is unfilled. When they arrived it was a mess inside! One of the humidifiers' fans doesn't spin. I told them I'm an engineer and trust me I'm sure it doesn't work. BUT they required me to upload the video to prove that or pay the shipping fee myself! 
2. When I was purchasing the humidifier, their system recommended the "MistAire™ Humidifier Decalcification Cartridge Filter" to me, so I added it to the cart, but it DOESN'T work for the humidifier I purchased!
3. We loved the design of the products, but from shipping to how their website recommends the wrong product to how they respond to their clients. This become the worst purchase in this holiday season for me!