I have tried different brands of colored contact lenses and I think the best one is FreshLook. I have astigmatism in one eye and I'm nearsighted in the other but the toric lenses and regular ones are so comfortable I wear my contacts for at least 10 or more hours everyday and I have no problems at all. However, when I try other brands, they kept getting dry, making my vision blurry (I wonder if this caused my astigmatism). When I blink they move. FreshLook is awesome!
In my opinion, colored contact lenses are not good for our eyes' health. And there are lots of stores selling colored contacts in poor quality. Therefore, I would suggest teenagers not wear colored contact lenses for the good health of their eyes. Instead, a pair of colorless contact lenses will be a better choice. If there are some situations you need or must wear the colored contact lenses, I think you should go to the formal glasses stores to buy some ones of good quality.