@drmalawi No, I went with a PB Lawbringer. However, since my DT/TS Assassin is my cow runner, it is easy enough to check. Did a cow run on players 8 mostly with the Lacerator, but also used the Lawbringer a little. The Merc is a HF and uses Infinity.
curse area and length are comparable. Lacerator is level 3 with 3.3 yards and 14 seconds while Lawbringer is level 15 which gives 4 yards and 12.4 seconds.
On the LCS there isn't much difference in the numbers Max damage is 13k for both.
Flee isn't a problem as the cows move so slowly and when they are in a crowd there isn't anywhere for them to go anyway.
Amp procs a little more often (33% vs 20%) and while the reduction is 100% vs 50% the cows die so quickly, usually 1 hit, when either is on that I can't really say that the Lacerator outperformed Lawbringer.
I did find one thing where Lawbringer was superior. I ran across two boss cows that were Fire Immune and because Lacerator doesn't offer anything beyond physical damage the added cold damage on Lawbringer made it quicker to kill these two. Obviously, a Sunder charm would solve this problem.
I also used a Lacerator on my Warrior monk to take Nihlathak out the other night. The level was full of PI Hell Mistresses and the 50% chance to Flee made much more time consuming. I did 2 arms with the Lacerator and 2 with Lawbringer and Lawbringer was superior.
I'm going to run some more cows with the Lacerator and get a better feel for Lacerator.