So what exactly is the info you are looking for...just more people to give a thumbs up for the Witt brake?
I understand that and at the time was also was looking for more information but could not find it so I coughed up the dollars and gave it a try.
The Witt brake is loud, easy to put on, cheap, fast delivery and is accurate. If it was crap I would be the first to say so.
I have and had several brakes...including the one from Witt on my write up.
also currently running a several Vias brakes on hunting rifles
JEC custom on a 243 tact build
and a few here from GAP
The newest brake I have is the JEC...it is also my favorite, wont get into right now but it is sweet and plan on getting one for my upcoming 6.5 saum build.
Good Luck with your search and feel free to contact me.