I've found that the eye relief on my WE Spectre replica is excellent, far better than any clone ACOG I've ever used. I can get a good sight picture with my face 4" back from the sight no problem, they really are much better than the standard TA01 ACOG replicas you can pick up.
That said, I use the magnified optic much like Ed does, spotting at long distances and occasionally to shoot a target which is a long way away. Outside of that the docter sight on top is my go-to.