Can anyone tell me the advantage of the Leupold Mark 4 PR series of scopes over their VX-I series? Just comparing the specs on the 3-9x40 versions, it looked like the VX-I is shorter (by 0.1"), lighter (by 1 oz), has more consistent eye releif (4.2"-3.7" vs 4.2"-3.2").

Is there some major advantage to the Mark 4 PR that I'm not seeing that justifies it being double the price (other than being "tactical")?

My intended use is for casual range use from 25 yards to 200 yards, with most shooting being at either the 25 yard or 100 yard, and it's getting mounted on a 20" HBar.

For reference:
Mark 4 3-9x40mm PR
www.leupold.com/products/scopes.asp (linking to the scope details isn't going to work with ASP, but you can select it out of the list)

IIRC the PR series uses the same glass as the previous Vari-X III series which means the optics are better/clearer.