Honestly, I think your original post says it all.....you have conflicting reviews on the monsoon and nothing but good on the Mistking. I just got a Mistking a few months ago and I do honestly love it. I hand misted for years. I'm home most of the day and it was just routine for me, but they never really liked the spray. They always ran from it. Since the Mistking is a fine mist, the one I have now runs into the spray. No more running and hiding. The monsoon on the other hand I have heard it a harsher spray, that is the main reason I didn't get one. I knew my cham hated that. I looked at youtube videos of both brands spraying too.
I wish I would have gotten a Mistking from the beginning.
Now, that said, It was a pain to set up. Not difficult by any means, just a pain. Because you do need to find a water reservoir to use, and you have to be able to drill a hole for the hose about an inch from the bottom of whatever you choose. When I first started looking at them, I thought you just put the hose down in a bucket of water. The pump is gravity fed so the reservoir needs to be slightly elevated from the pump. So I have mine sitting up on a stand behind my cham cage(my cage is in a corner pulled out to create a triangle space behind it), you can barely see it. And the pump is sitting on a cookie sheet(just in case it ever leaks) under the cage on the floor. I will be adding a cage "skirt" of sorts so that it is completely hidden. It is fairly quiet. Unless I'm in the room when it goes off, I don't even hear it.
Good luck on your decision!