I was pretty excited to hear about the WD-800 and was just about ready to pull the trigger on a WD-800 after reading through these threads. But then something surprising happened.
I'm not currently gigging, but I'm playing in two different regular (i.e. weekly) jam sessions plus I just started with a third that expects to play about twice a month. I made a point to use my D-800 in each, which let me hear it in different types of rooms playing different types of music on different basses with different players at different volume levels through different cabinets. After doing that a few times, I concluded the D-800 sounds D**N good and I actually talked myself out of buying the WD-800. I love the idea of having even more flexibility and tweakability but, as of now, I'm *extremely* happy with what I have and will stick with it. It just works that well.
And I think the fact that the "entry" model is so good that it convinces me not to upgrade speaks volumes about the design of this series of heads!