It may have fibers ( mineral wool) , but they aren't glass so you don't get the scratchy thing going on. I used some 1" on a project and enjoyed this aspect of it. it is also heavier in weight than fiberglass board which caused me not to use it in larger cloud situations. I didn't want to concern myself with securing any extra weight on the 4' x 8' x 4" panels I was building.
as far as frames- it's easy to put 703 into a light woodframe and wrap it on one side with material and bolt it to the wall, the 703 is light enough that it just sits easily in the frame with no backing or even any sort of attachment to the frame. I'm not so sure this is true of the mineral wool as it's somewhat more flimsy in general. which is why i suggested just securing the raw mineral wool to the wall and then cover it with a cosmetically pleasing ( preferably fireproof) frame. In thinking this further i don't think I would try this hanging method with a 4" layer of mineral wool but 2" would probably do just fine.
the 1" mineral wool i used was on the wall inside of a helmholtz resonator. i used drywall screws to secure it to the wall and then built the resonator around it- using the wall as the back of the resonator.
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