I'll post pictures of what I've done soon. Here is my breakdown of assembling a crapton of DE.
Raider- difficult, but the parts fit together pretty well...After my third one I am ready to stop modeling for a while
Warriors- Easy to assemble, fit together great
Reavers- Fit like a glove, best GW model I've ever assembled
Wyches- have that annoying base peice with the slit in the middle. Besides that, not a bad model to assemble...but that slit....ARG
Incubi- Satan himself cursed this model. Their peices dont want to fit together and are a pain to keep in place. GW must have thought "hmm, we gave them good fitting models for the rest of the set, here is a square peg for a round hole".
Archon- see above^^^^^^^^^
Scourge- my homemade models, will post pictures soon.