Could someone tell me the pros and cons of A CCFL angel eyes? I just bought an 01 M3 and I love the look of the angel eyes. Do they have cause problems with the lighting and are they something that have to be professionally installed?

nope, simple as 1-2-3. nothing to do with your lights.
you only need to open your headlights, put them in and some wiring also needed

nope, simple as 1-2-3. nothing to do with your lights.
you only need to open your headlights, put them in and some wiring also needed

+1
there's a detailed write up in the diy section of this forum, its a pretty simple install.
then check the lighting forum sale for a apecial price on chromiums.