I've been shooting selfbows since 1989. Started putting the original Fast Flight, Brownells on mine. 16 and 18 strand strings. Always pad the loops!
2 bows, in particular, have been shot with HPM, such as Dyna 97, 450 plus, and Astro flight, since! 1 an osage sinewed backed of my making, 55lbs at 27", and the other, a black locust, 58Lbs at 28"flat bow built by Gary Davis of Michigan.
No overlays and thousands of shots! Both have taken animals!
My reason for using, I can shoot a heavy arrow for hunting with good performance!
Benefits, quieter, less hand shock, and the material wears like iron!
Personally, IMO, overlays are for looks!