Yeah, I really kind of like that set-up as it obscures less of the target and definitely aids in quick target acqusition. The drawback is that your're giving up a little precision. I think the trick with that kind of sight is to ignore the ring and allow your eye to instinctively put the target dead in the center, and then put the front site where you want it.
The ghost-ring is way, way better in a low-light situation too...