i still don't get how some people don't think funcional parts look good. personally, i think lip spoilers look pretty bad, mostly because the aerodynamic effects (especially w/ the top down) are minimal.
I'm not fan of Big Ass Ugly Wings, but if they work, they work. A secondardy benefit of this design is that it looks to be totally removable when you're off the track. To me the primary benefit of this design is not potentially crushing your trunklid or having to worry about reinforcing it.
The only drawback I see in the mounting location is what Greg asked if it is sturdy enough to not get ripped out with 100lbs+ of downforce. I've never looked too closely in that area.