Work's great the first time (if conditions are perfect).
After that, however, any number of factors can contribute to the whole
device not working at all.
Any pressure on the bottle can flood the chamber, causing water to pool
out of the sides and soak whatever it's sitting on.
Any contributing factors that can lead to the mist not exiting out of the
spout causes the device to vent the mist out of the bottom through the
circuitry instead, potentially causing electrical issues.
Contributing factors include; slightly angled device, any pressure on bottle,
device dial turned too high too quickly after being turned on, chamber overfilling
slightly through unintended areas and causing the spout to cease releasing
mist, insufficient power, and others yet unknown.