I needed a pair of natural-looking brown lenses for a cosplay, so I couldn't get lenses with a very large diameter. I didn't want to look like an adorable little kid, as the character I was cosplaying is an adult man.
The color change was VERY dramatic. They blended into my blue eyes very well because I have a yellowish/green ring around my iris, so it appeared to be a very light brown when I had the lenses in. I've been wearing contact lenses for a good few years now, and they are very comfortable. This whole brand, in general, is very good if you want a natural looking change to your eye color.