The thing I don't like about this is it is going to create a fair amount of drag by kicking the air up. So the strip itself is going to be trying to hold yer V Dub back.
What is more ideal is something that follows the roof line then just ends abruptly, this way the added "Spoiler" does nothing to create its own dynamic drag. I have looked hard for a commercially produced alternative but can't find one, certainly not one painted to match for under $100.
I like this for cheap and easy, for your car this may be the trick because I believe the trade off between the serious lift drag and strip induced drag is worth it.