So obviously it stacks, which is kind of amazing in its own rights. However what are the caveats?
How do resistances work? If I equip Positron (good anti-tachyon) and Graviton (tachyon neutral) at the same time, what is the actual percentage of damage received from Tachyon guns? The best shield for the job equipped? The average between the two? What shield hit effect will I actually get?
We're still considering it as it is pretty cool, but it is also very strong. Hopefully we find a solution that lets us keep the two LF shields on the Anubis.
As for resistances, the game takes the one you mount first. Mount Graviton first, you get the Graviton type, and so on. The second one is just a pure stat stick.