I could never get enough mechanical advantage to overcome the force needed to start six balls at a time and I could never make the press stout enough that I was confident in using it without breaking it.
The two ball design works better for me but you must understand that it can't be used for five shot revolvers since the geometry of the cylinder is wrong.
If you have not seen photos of that press here they are.
Here is the press in action using a junk cylinder
Here are some of the jigs I made. Colt, Remington, Walker, and Ruger
And here is the shooting box mount