Are you looking for some air back there? I was glad they added the rear vents on the 10s because I have kids.
However, the rear vents are NOT powered by their own fan.
Yes, you can feel air if you put your hand on it. Can your rear passenger feel it? Maybe if you turn it all up HI. Even that, I'm not sure they would really get relief (from the heat for example). It functions no where near the strength of the front vents.
Or even vents on a minivan (which does have a rear motor).
Summary:
- Nice to have, ok.
- A real factor, no.
- Overrated.