Damn that looks nice than mine!
Yeah, you kinda threw me too when you said "tactical slings".
I like my single point sling on my 870. Its just so comfy and easy to bring up or swing out of the way. You kind of have to keep a hand on the gun when you are walking or it swings around but aside from that its all good.
The main reason for using it is so that you dont have to bring it down off your back when you want to shoot. Its already right there for you to use. So while out for a long hike, it does get a bit annoying, its quicker to get at.
but this one pictured above looks nicer than mine. That triangle piece probably makes all the difference in the world.
There are other slings that use a bungee cord too. I dont know what those are like to use. It would be good to hear from people on that one.