I’ve been using the Mec sling with the Mec Connect attached to my coat since about 2013 or so. Before that, I had a Tubb Heartbreaker, a John Weller Match sling, a CC with the super wide cuff, and a couple others that I can’t remember. The Mec with the Connect is really great in that it locks the sling from moving rotationally on your arm as well as up and down. You can set it up to pull from the inside, outside, or center of your support arm to help manage pulse. It’s ridiculously expensive for sling, but considering that I’ve been using it for 7 years at hundreds of matches plus a crapload of practice, I guess the price works out ok. I keep a brand new one set up and ready to go in the trunk of my car for the day that this one finally breaks.