It takes quite some maintenance to keep it going, since my one kept stopping every now and then and it did not produce enough fog for my terrarium back then.
I use a "real" rain system now instead, three actually, one BIG system for each of my two large terrariums and one for my baby/small RF's...
But I guess the fogger is enough for smaller installations or if you just want the visual effect of it, since it can get quite spectacular with the right light on the fog ?