Quality and fiberglass are two words that rarely seem to go together!! Part of the problem is perception: I doubt you'll ever find a fiberglass hood (or valance, trunk lid, side scoop, whatever) that fits the way you would expect an OEM piece to fit.
Plan on having to massage your hood once you get it. Also, you may have to cut the scoop opening as well. Plan on using light duty springs, or better yet, don't use any springs at all and go to a prop rod.
I have the hood from Branda and am generally happy with it: I did have to cut the scoop openings and massage it to fit. I tried using light duty springs on it, but even those were too much. I have the pins and am happy with it. I could easily have used the hood latch as well, but didn't see a need for it: the pins do a much better job...
The hoods from Mustangs Plus are probably from Maiers' Racing. I have the Maiers front valance with molded scoop. Didn't fit very well, but it is a stout unit, holding up even under the abuse of a tree branch going under the car (made so much noise I thought I ripped the whole thing off, but just had a little crack in the spoiler...).
Good Luck!