I know it's a relatively cheaper part but if you don't have the sticker there's no branding on the back. I'm not in it for resale value and I kind of like the PORSCHE block letters. Not like it's an inconspicuous car already, but it's nice to have make & model displayed.
On black or grey it looks more natural but on red or *cough*yellow*cough* it looks a little funny with a gap between the black rubber bumpers, like something's missing. I may be a little partial but I feel the rear is more balanced with a lower plate. Turbo valance doesn't hurt either.
Slam, my wife really likes it too. I think it's because it announces "Porsche". It's not like the average guy doesn't know this isn't a current $50k sports car; at the least they'd think it's a very valuable classic. When I first moved to the area I had a neighbor pop by and ask if it was new! It's a f***in Porsche, let everyone know it ;P