ams511
Contributor
Last year, while my old fins were still perfect, I posted a related query asking about other users' opinions. At the time a few commented that the Hollis F2 was too stiff in comparison to the APS Mantaray which it replaced. As a result, the Hollis lacked the 'snap' that the more flexible Mantaray had. That might mean the Hollis F2 might not suit me so well.
The stiffness of the Manta Ray fins varied depending on the color of the fin. I do remember when the F-2s were released that the stiffness was increased slightly over the black version. So if blacks are what you are using it may not be that much of a difference.