For fear of seeming too sure of myself, my opinion of it helping erectile quality is: "horse s**t"
Not going to do a damn thing for nor against the vasculature of the inner penis.
PMMA will produce a
Dick that's..probably harder than a natural
Dick, because that collagen-supported skin feels harder than regular skin, but is skin that doesn't feel fake.
It might make your 50% semi feel more like an 80% semi
But it won't do anything for your staying power nor ability to get hard.
If any enhancement it'd be that of feeling like the vag youve been plowing for years suddenly got tighter. If anything that might make you pop quicker. I know if I suddenly started humping my way through a sorority at ASU, my time before popping would be lower.
The confidence might give you better EQ, but that isn't a physiological change. Otherwise, no, no mechanism by which filler is going to somehow make it easier for your cavernous bodies to fill up with blood.