I admit to owning 19 pairs of barefoot shoes. Hi, I'm a wolf and I'm a barefoot shoe'aholic. I bought the Fila socks many moons ago, and now I only buy the Injini because they fit so much better. When Amazon has a 20% off deal on Injini I stock up. That has nothing to do with living in the land of REI and Amazon, it's just that the Injini are genuinely better.
The Fila socks work okay with their shoes, but not with Vibrams. If you go to Fila, you will find they have stopped making barefoot shoes, what does that have to say about your choices?