I had the 5 series of this mount and was very happy with it. They made the 6 to accommodate the new mount adapters for lights and speedometers. I bought one of the adapters so I had to buy the 6 mount for that to work. Overall the 6 goes on the same way and works well. It locks the Ortlieb handlebar bag in place just fine. I'm probably not used to it, but it takes a little more to get the bag on than my 5 series. Otherwise it's good.
But there may be an issue with the adaptor depending on your bike. So read my review on that as well.
Ortlieb Ultimate 2-6 Handlebar Bag Mounting Set E185
Rob Kerr on 6/23/16
Mounts easily and works great. I should have bought it years ago instead of switching the mounting set between my bikes.