I have 2 years experience with FiberForce and 10 years or more more with spun fiber reinforcement. I used DVA reinforcement fibers in the past but have switched to FiberForce for 2 distinct advantages, First, it has an impregnation of light cure which allows for shaping and freezing that position/shape prior to incorporating it into the processing/cure of denture. It also has a silane coupler impregnated into the material which enhances the bond to acrylic.
Worth mentioning is a special thin wax which has an ideal blockout space for incorporating stops on the mesh, and a cool vacuum chamber that allows for perfect adaptation to model using it.
With all fiber reinforcement, placement is important to get full benefit of material.
I have never gotten back anything I have reinforced with any fiber.*
(*in conjunction with eliminating factors which would have propagated fracture to begin with)