I am the proud owner of a Leigh D4R and like it for the most part, except when I see guys cutting pins and tails at the same time on other jigs. Well, the other day I was "cruising" the Leigh website when all of a sudden I see an "upgrade" for the D4R. I knew they had started making a line of smaller jigs and made a new 24" jig called the D4R Pro, but had not put much time into looking into it. All of a sudden I see you can now create and cut half-blind dovetail pins and tails at the same time! God has answered my prayers. I love the quality of the Leigh jig, it will last me a lifetime, but I always hated flipping the fingers around to cut pins or tails and re-setting the board width,ect,ect. I pulled the CC out as fast as I could and purchased the upgrade, it looks pretty staight forward. I am looking forward to cutting half-blind dovetails in half the time from now on!