Some issues I have with it:
1) I wish the numbers had thinner lines to better match the "Porsche", but it's really not that apparent in person and looks nice. They just don't photograph well.
2) Getting the numbers to look correct with the curve of the existing emblem (which is why I think centered may be best).
3) The number spacing is too tight in my pictures. Not a problem, of course, since I can space them however I like.
I've ordered another set, so I'll play with it more when they arrive. I'll find the best aesthetic arrangement and try it on for a while. I can always remove them at any time.