I had mounts much like the Talley on a browning A-Bolt years ago, and they where about the only thing that I liked about the gun (In fact, they probably where Talleys). I currently have dual dovetails on my go to gun, and I like them as well. I find it odd that people think that the Tally setup is stronger that the dual dovetail system. There may be one less joint, but they're also aluminum, where the Leupolds are metal. I personally prefer the Leupolds unless it is an ultralight gun where absolutely every ounce counts.
Mike