I removed mine today and it looks a lot better. The reason is, is that the emblem is too big for the grille area and clearly looks like a stuck on afterthought.
I tried the fishing line/dental floss trick but the line kept braking. Instead I used a plastic putty knife with a bevel point (flat side towards the paint) and carefully worked it and then used Goo Gone, a paper towel and a fingernail to get rid of the remaining foam adhesive. Total time was about 10 minutes. One thing I did when using the Goo Gone is to put one hand inside the grille so that when I presssed with the paper towel, I could support the area of the grille I was working on from behind.
Only thing that sucks for me, is that there are several lines in the paint where the emblems once were. I guess the paint was still wet when they stuck mine on or something.
Do it, you wont be sorry but if for some odd reason you want to put it back on, the emblems come off intact so I guess you could still glue them back on.