I have had one for several years and use it frequently in the summers in So Cal. I have the large model with the dual vents. I place it on the rear seats with the vents blowing on each side of the pilot seat. (I usually fly solo)
It works very well, providing cooling air during climb to cooler levels and on descents. The real key is using ice blocks instead of of ice cubes. They last much longer. I make mine in silicone bread molds that I put water in and freeze. I have also thrown in a soft drink out two, in the cans of course, for an after landing treat.
In the 10 years or so that I have owned it I have only recently had to replace the water pump (about $40).
At full capacity it does weigh about 50 lbs.
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