Compared to the regular DMRII, the DMRII Pro has (to my eyes) significantly improved clarity and reduced CA, with better colors overall. In my opinion, they're a great value when you can find them with a discount or on sale, but with the Razor Gen2 price drops, that may be the better way to go if you like the reticle options there. I've always liked the GAP-style reticles, but with two USOs with the original GAP, I felt I could sell my DMRII Pro and step up to the Razor now that the prices have dropped and still have a simply, uncluttered reticle to use when I wanted.
If you can find one at a good price, go for it. They're solid optics that will serve you well.