As a collector they are IMO a beautiful gripper and a unique gripper as well!
As a user I find several advantages that I like, 1) the smooth handles are easy on the hands if used for recovery.
2) the slickness of the handles make them challenging if a little imagination is used in your training. 3) the geometry of the gripper due to the larger OA diameter torsion spring gives the close a different feel that possibly
hits the muscles slightly different which is a good thing when it comes to variety!