Hello!
I'm an avid Shield user, and when I tried to pair it with the Companion Talent (Get 15% Weapon damage for allies and skills within 5m) it just didn't work.
Why?
My life depends on it, it's literally my closest companion. The talent even works with the Firefly.
I'm not sure if this is a bug or is intended, but I hope that in future shield users will be able to use the Companion skill. We really don't have much going on for us at the moment in terms of damage.
Also, some weapons are bugged in the Striker shield, like the MPX. Video
I've attached two videos as proof. First one is a test of every skill with the companion talent. Second one is just a buggy MPX.