I've been debating about adding one of these to my nep tent for some time now, as it's an (relatively) inexpensive alternative to an automatic misting system.
However, my first, and only, experience with these has constantly been a warning siren in my head.
Years ago, I used an ultrasonic fogger in an iguana enclosure. The metal "membrane" on the thing kept crapping out, and effectively tripled the cost of the machine within a few months. It also seemed to only work at a certain water level that had to be maintained within a tolerance of 1/16 of an inch or so. Too little, and it just fizzed, too much, and it bubbled but produced no fog.
For those of you that use / have used them, what is the average membrane life on them? Also, how long do the units themselves tend to last before you need to buy a new one?
Maintaining the appropriate water level in this situation won't be hard, but I don't want to have to replace the membrane every other week. In that case, I'll probably go ahead and try to rig a proper misting system.