I can still fog Revision's Desert locusts with the thermal lens and their anti-fog wipes, not so voodoo magic. It's all down to humidity and body heat, these things are all designed for environments with less than 50% average relative humidity, UK averages at around 50 - 60% in the summer and 80-90% during spring and winter.
ExFog works well, its less expensive than the Novbitch one, and you can either fuck about with the magnetic end bits or just point the tubes in roughly the right direction - just don't forget to charge it the night before, because they don't hold juice very well (this applies to both ExFog and Novbitch ones).