It depends on what flight characteristics you want to emulate. Jump out of an airplane with the anatomy we have, and we are effectively birds, with the glide ratio of a penguin, but a very close approximation of the basic configuration of a bird, even without control-enhancing feathers on our fingertips and asses.
For the wing-loading and lift/drag efficiency of an eagle, we'll need to grow arms lenghtened to something like 3 meters each, have our bones pared down to the barest structural minimum, our lungs and aerobic capacity quadrupled, etc until we look more like birds than humans. Athough GE may enable this, it seems more likely that we will closely model the experience of being a soaring bird, and enter the experience virtually, with full-sensory immersion (Star-Drek Holodeck).
If you have some appreciation for what being an eagle must be like, and you learn to fly sailplanes, you can exceed the capabilities, if not the instincts, of eagles, and all other birds. I'm not convinced we can presently exceed an eagle's sense of joy in the present stage of human evolution: I've flown with many eagles and hawks, and at the higher altitudes, they are obviously not hunting or travelling. If youspend much time with them up there, you can plainly perceive that they are purely, immensely, flambouyantly... enjoying themselves.
