I heard it was a lethal gene too, but have yet to find anyone who can confirm that from first-hand experience. I haven't exactly tried very hard, though. I probably talk to Kevin at NERD on a weekly basis, but never think to ask. lol
It's either lethal, or it's not very different for a "super". Either way, I think it's probably not worth doing a spider x spider pairing for that reason alone.
That spider from a spider x spider pairing...I was thinking about buying it, just in case the guy hit on some subtle co-dom (like a vanilla) where the het version isn't all that obvious, or a recessive.
Then I realized I've bought bumblebees for about the same price, and we know those are genetic. lol