Omer stingray foot pockets meet my requirements, a stiff sole for good energy transfer to the blade, moderate stiffness tendons provide adequate blade support without negatively affecting its flex, and a soft comfortable pocket.
This is the first I hear of Salvimar react foot pockets. So far I dislike everything Salvimar has offered so my feeling is to stay away. Here you can find my review of the first Salvimar foot pockets Salvimar Delta-one foot pockets review.
Looks like I was right because no one is using them now, and going by what you say even Salvimar has moved on to different foot pockets.
Leader fiberglass blades are crap. Leader foot pockets are similar to the omer stingray in appearance, but they're not made the same. When I sampled them a few years back they were soft like noodles. I suggested to Leader Fins' manufacturer to increase the shore hardness, I don't know if they did it.