An old thread, but the content is quite relevant at any time.
The 60" Black Hunter longbow, and all its iterations, as there are many, can have a valid working brace height between 6-1/2" and 8-1/2", use whatever works best for you. I've had many of these bows and they will all be better than the best of archers in terms of consistent accuracy. Their overall design is quite good - a heavy and well laminated riser with a deep cut shelf and pistol grip type handle for stability and shock absorption, and bamboo cored glass limbs for smooth stack free drawing. The metrics are as good as any other really good stickbow, it is what it is. Quality of build varies a bit, but even the lesser ones are only a matter of aesthetics and not performance or overall durability. It would be hard to beat the riser build of most if not all, but it's the limbsets that can sometimes vary in terms of tiller, build quality, and overall durability - but hey, for lots less than a C note a new set of limbs can purchased. If a more precise limbset were available that'd probably be a good thing.
My current Black Hunter is the "Elite" model sold by Big Jim - it's just got a fancy riser but the limbs are all the same. I use a 7-1/4" brace height and a 16 strand B55 string and it's very quiet, with no twang on release, more of a low growl "boing", with no string silencers. Key for me is using a Dacron string with 16 fat strands and I spin one up to 57-1/2". I use a strip of loop Velcro for the arrow shelf and a piece of thin Teflon tape as the strike plate.
I would be doing no wrong if this was the only stickbow I could have, and since 1953 I've had well over ten dozen bows.