I just completed the VoG for the first time today, it wasn't my first play through but it had reset before I defeated Atheon on other attempts. All I got from my previous attempts was the sniper and ascendent materials, I thought I would try and again and hope for better when I finally defeated Atheon. On this run I got nothing but ascendent materials and chatter white shader. Now I know it's my first completed run at VoG but I am a little disappointed :(