NY,
I have the volquartsen trigger unit in my MKIII Competition. With the wide trigger and lighter action, the pull on my gun is almost scary light. As the Ruger can be dry fired safely, before shooting live rounds I always dry fire a few times and have others who shoot my gun dry fire before any live ammo goes down range. This gets the old mind wrapped around how light the pull will be.
It is completely safe, and I like it. Others who have shot the gun also comment on liking it, but I feel that it does add a little more complexity to just plinking with the gun. And I am not sure I would recommend it for a gun that might see a lot of duty as an entry/training gun for novice or young shooters. At least at first ;^)
Craig