To me VTAC and Blue Force are pretty much the big boys but there is a new guy I tried for a sling for my M1S90 Edgar Sherman Designs. He makes them pretty much as orders come in and actually made mine with 1” tapered ends instead 1 1/4” at no charge. The basic sling is $40 and the fanciest with all the QD options is $70. It has no loose or hanging material and is easy to use. The one thing is if you want padded sling he doesn’t offer their yet. It’s a great little sling with quick and easy slide adjustments. Just another option ... https://www.edgarshermandesign.com/product-page/esd-sling
To quote the late Louis Awerbuck, "You'll hurt your peepee."
They do have some utility with a carbine or pistol/sbr when you have on a pack and can spare a hand for the grip of the weapon. It keeps sling and pack straps from interfering with one another.
Otherwise, yeah you'll hurt your peepee....
On an 18" SPR they're not terribly useful. I'd roll with an MS1 or a BFG for that application and call it good.