I just received a new tang sight from Mike Neumann, SA for my Martini match rifle in #2 Musket.  This sight is of the Dr. Goodwin style, but with a bit more 'meat' everywhere, quite stoutly made.  Compared to the Holbrook Dr. Goodwin's, it does seem quite a bit less delicate and of more stable construction - the staff actually is a rectangle with the spindle in the middle.
The nice touch about this sight was that I was able to customize it to my rifle - I requested and got a vernier scale for the windage adjustment, a scale in degrees and minutes for my specific rifle, taking into account sight position and barrel length, a custom-made base (no one makes target sights for Martini's  ) allowing me to adjust down to 75m and up to 1200 yds without having to raise the front sight.
Upon reception of this sight, I was impressed - this is quality work! All parts milled, no slop in the threads, an ingenious angle positioning system, a perfect finish, nice and readable scale.  I mounted it on my #2 Musket Martini, and with the very 1st target I got a nice 99/100 (MLAIC rules), albeit at 78m - taking into account the very 1st shot that hit paper.  I have to say, I'm impressed - and glad that I purchased the sight.  This really is quality stuff at a avery good QPR!  The man basically delivers custom work rivaling the top US sight manufacturers, at a better price.  At any rate, he the quality of his work succeeded in convincing me...