I have a Tac C that I used at Thunder Ranch recently. It was great no problems with clean draws and it held my Commander well.
I saw many Blade-Tech holsters in use, by some of the instructors, and my classmates. They also worked well, the only discouraging remark was the Blade-Tech was a little rough on the gun finish. My Hellwig with the roo-skin marked my ss slide but did not abrade it.