Pluses: These lenses give you a natural, lighter look if you have medium brown eyes or lighter.
Up close they come off as hazel, dirty green, but not blue, which is better in my opinion because the transition from brown to green looks more natural.
From far away and in the pictures they look either hazel or brown, but still lighten your eyes noticeably.
So, not a dramatic, but a natural and visible change.
The lense is almost indistinguishable from your natural iris, in daylight as well. They blend smoothly with your natural color and nobody will know you're wearing lenses, not even people who knew you for years.
Minuses: Slightly uncomfortable after weeks of wearing them, but tolerable with eye drops. Expensive.