After studying the pics I'm torn between the flat side vs. rounded. The flat side to my eye looks finished and transitions well from the " fat " side to the thinner trailing edge. The rounded looks good but the transition from fat side to thin trailing edge is just a little off. Maybe it's just me and maybe some of that would go away with paint color vs. primer. Also I think the flat side carries out the angle of the OEM spoiler top better than the rounded. Or I could be full of crap
. I would have no problem installing either one on my car and will continue to follow this thread.