I've tested one when they came out.
For those who don't know,it chills the SMOKE from the built-in smoke generator to below room temp so it won't raise.
I didn't see anything on the floor even after long use.
As a side note
I recreated the effect with the output of an F100 being cooled by either wet or dry ice.
You shouldn't see any significant condensation from it. Long term usage and your floor will start to get sticky because you do have a lot of fog rolling across it. Normal stage mopping and you'll never notice it.