Just bought one for a laugh to see how it works, and it rocks!
Basically it makes the waterbowl in Bo's tank look like a nutty proffessor is doing experiments (misty fog compnig out of the water)
I have set it up on a timer to see if I can remove the need for spraying for morning and night humidity increases (will help if I have to go away for a day or two)
I waited until the humidity held at 70% for a bit then turned it on, and it went to 91% in minutes! Just thought it might be a good idea for everyone else (bought mine VERY cheap on ebay)
£8, then add a timer (which I already had) Took 4 mins to change the humidity from 70% to 93%, so have set the timer for 5 mins twice a day, nice and easy....