I have naturally greenish/blue eyes with a little bit of hazel around my pupil. 

These blend quite nicely with my eyes but when you look closer, they have that "fish eye" appearance. The lack of a limbal ring on these also make them very pale and "bland" on my light eyes.

The only pro I can really think of is that the enlargement is perfect size. They do make my eyes appear to be larger and tad bit more sparkly.