Ive got 3 or 4 VCAS slings, a padded VTAC, and a Magpul MS1(original, pre-release sling).
I REALLY like the VCAS(as you can tell) with the acetal hardware. I really dislike the VTAC, mostly in the way it adjusts. I have mine on my bolt gun so its not a big deal as it doesnt get adjusted much so I havent swapped for a VCAS. I think(dont quote me) the VTAC is longer than the VCAS and thats why I got it for my bolt gun since the QD sockets are pretty far apart vs. an AR15.
I got the Magpul MS1 when they first came out and single points were all the rage(2008). Ran it for a bit as a single point, racked myself in the nuts to much, choked myself to many times, now I run it as a 2 point and its ok, but will most likely get replaced, but its on an AR that is a loaner most of the time so it serves its purpose.