For display pourposes, the single point of contact bolt on's are great. I would not use them in the field.
TRAP - Do you like them for collector's authenticity, or for practical application and use?
Now, if you don't mind mounting one of the busings in the bow you have not yet acguired, Ther is the option of the converta quiver. Kind of a cross between a bolt on and a spring arm. The top has the spring arm, and the bottom has the bolt attachment. Solid conntedtion and no swivel.
Just my thoughts.