Appearance w/o Rear Spoiler
Here's mine w/o the spoiler. After one month, I've had no excessive dust build-up, problems with rain obscuring the rear view, etc.
When I drove with the rear window down, I did get a get whiff of the exhaust, but that's to be expected. Back when a lot of folks drove "station wagons" since SUVs weren't invented, you knew you'd get an exhaust smell with the window down. The exhaust didn't smell like sulfur since we didn't have catalytic converters, but the exhaust smell was still there.
I'm glad I left it off.