I'm writing this while away from the unit so this is by memory.
I purchased the Monsoon for my very first vivarium. It is 18x18x24. I have never had one before so will give you my impression of how things are working with the Monsoon. First off it cost about $100.00; this would be in the same price range as the Mist King Starter package. The unit is very compact and nice looking. So it would not be an eye sore for anyone placing the unit out in the open next to a vivarium. The unit comes with a clear grayish plastic tank which holders about a gallon and a half. I have not filled it up all the way yet. The controller unit fits on top of the tank and is rather sleek looking. The area were you pour the water in is shaped in such a manner that any slight overfill while you pour water in runs back into the tank. The hose connection is a quick connect that you push the black water line into. Very easy to install and remove. I have already done this and any water in the line will run back down towards the fill hole of you hold the line there until it drains. The hose starts out as single line then splits into two with adjustable nozzles on each. There are suction cups for attaching the nozzles in place as well as two addition suction cups for you to place on the line where needed. The controller unit has settings for how long you want to spray, the time frame between spraying. This is done by just turning the knob to the appropriate setting. There is a instant on push button that will keep spraying until selected again. A button to select timer mode and I believe an off button all with indicators. If the power goes off the unit will restart itself by misting and then going into the set cycle. The unit is very quiet and the only time I have heard it being the least be louder is when it first purges it’s self during setup or if you removed and reinstall the line.
So far I have been very happy with the Monsoon. It does a very good job of wetting down the interior of the vivarium. The humidity seems to be holding in the area of 97 to 98%. I have most of the top covered with glass which I just installed yesterday and have reduced the time between spraying to eight hours. I might even be able to go longer then this.
The instructions say it can be expanded up to 8 spray heads. I'm not sure what the performance would be like with that many heads. If you have many tanks it might be better to go with the proven Mist King setups.