Picked up a the universal gun bearer last season and used on MR marshall pack. Overall I like it a lot, I think it’s the way to go. My favourite thing about it is the ability to use hiking poles and still have my rifle easily accessible. That helps me feel more at ease while hiking in grizz country. I love not having to deal with a sling constantly slipping off my shoulder.
Cons: it puts a little more stress on the hip. And you have to get used to having your gun barrel always being in your vision.
Pros far outweigh the cons IMO. I would recommend it to anyone.