I don't know anyone locally that is shooting one of those. That being said, the last 6 uspsa production titles and the current world production and open titles are held by guys that shoot Tanfoglios... I am pretty sure that gun is the one that Eric Grauffel shoots in open.
I bought a Witness in 45 acp about a week ago. I have not even shot it yet but everyone I have asked or what I have read says they are good guns.
The Gold series is a super grade pistol from my information.