I like it. Not crazy about the vest beneath the webbing, but it's not a deal breaker by any means. He still looks kick ass.
I have a customized Mercer as well; used the Dollar General green Shipwreck body and gave him 30th Anniversary General Hawk's webbing. It doesn't look too bad, and sure beats the hell out of the colorful uniform he used to wear. I understand his background as a former member of Cobra and how Hasbro wanted him to resemble his past, but he's now part of the U.S. military and needs to look the part.
In fact, all of my Slaughter's Renegades are customized. Red Dog now has Battle-Kata Roadblock's body and Dojo Battle Roadblock's tactical vest. Since he's a big guy this body is perfect for him. He no longer wears the headband nor the necklace. No more football jersey for that guy; he's now military ops-worthy.
I used the ROC Pit Trooper's body for Taurus, along with the tactical vest from the ROC Pit Commando. And, yes, he's Taurus, the way he was meant to be known as, NOT Bull!