I had about 100 of these at a time. Planed to use them too, but as for now all they did for me is practise shooting - or better call it messing around. As it's a very cheap head, though quite tough it can take a punishment and you don't have to worry about wasting big money. It also lends itself to be "pimped" into different (?usefull) things now and then :D
If you need a pipe reamer to remove coal crust - they work real nice:
Here is how it's done:
I also make a special bird-/small game point from them - which I call MA-Barker. Quite silly name, yes I know, but that's what I called them once and it seems I am unable to change it ever again ...
......
In general:
Their construction is is fairly old and to be found in many different broadheads of their time (i.e. early Bodkins, Hill Hornets etc). The one problem with all of them is, if you sharpen them double bevel, as most people probably would do, you have the copper braze along the edge. No good. I've always sharpened them single bevel to get steel into the edge.
edit:
BTW Rob, I don't think you have to apologize for starting a broadhead thread! Is their really something more interesting out there