So keep them covered and strike when you have a good shot. These are wonderful. They have speed and are relatively cheap. Not to mention the fact that they simply are some of the best looking models in the Eldar army. The option to put a shuriken cannon on one in every 3 bikes is excellent too.
More shots are always good.
Shining Spears - I must confess that I don't have any experience using the shining spears. This is mostly due to the fact that there isn't a model for them. However, I've heard rumors that they are making a new model for the shining spears. They look pretty tough on paper, we'll see how they do in the air. Swooping Hawks - I've had a lot of discussion on the swooping hawks, and we've come to one conclusion.