The first focal plane reticle is an outstanding feature, if you've never had a scope built that way before you're in for a treat. There's no zero stop on that scope, but if you read the reviews someone commented that there's an aftermarket kit available to convert it inexpensively. If you're dialing a lot of adjustment and get confused (happens at night sometimes, or just happens) it's really nice to be able to go back to a known zero point and start over, or to re-set to your primary zero (100, 200, whatever) after a day of shooting so you know where it's going to hit next time you take it out.
You might want to think about shopping for LOW 1913 30mm rings right now, maybe you'll be able to get your hands on some by the time you get the rifle and mount together.