I didn't like the Aimpoint sights for driven hunting, but preferred a very low mag scope, the ultimate for me being a Swarovski Z6i 1-6x24 with a CD-I reticle, so either that or open sights would be my choice.
Some open sights seem much better than others, I picked up a Merkel Helix today that had a really nice set on, really came to the eye nicely but unfortunately I didn't get to use it in anger!!