Dave,
I just picked up a pearly, salmon-colored Viking the other day. I love it. You are right that it seems to be an under-appreciated disc. My question is, sometimes it seems the pearly plastic makes discs fly different than the clear or totally opaque. Have you noticed any difference in flights between Vikings?

And again, I have to sing the praises of the newer Pro plastic. This stuff makes me feel better about myself and the world around me. With Pro plastic in my hand, I know it is going to be a great day.