Interesting, there seems to be a variety of experiences - thanks for sharing. For the people that say vented seats are noticeable, do you have the HVAC on Auto or you have specific settings for the vents? I assume the former but just trying to exclude other scenarios.
Now in order to normalize the results, what would be helpful is to get some feedback that is somewhat objective and measurable so we can compare apples to apples. If you get a chance...
Start your car
Verify HVAC is set on AUTO
Set driver seat cooling to 3 (max)
Set passenger seat to 0 (neutral)
Put your palm on the middle of the backrest
Move your palm away from the backrest (perpendicular)
What is the distance at which you can still feel ANY effect?
I get about 1". I also tested with engine on/off and climate control set to Auto vs. Fan set to Off. The latter seem to increase flow to backrest a tiny bit.
Also, if you have any ideas on how I may be able to force Lexus servicing department to do something about mine not working as expected, I am all ears.
Thanks!