I built the Ork side of the new Kill Team set, and damn, they are very cool. I made every one of the specialists and two "normal" Kommando Boyz. Lots of good bitz left over to customize even further.
They are of the not-quite-interchangeable parts school of sculpting. Everybody has a good pose, but only a few variants within that pose. Some parts do fit on other poses just fine, some need encouraging.
My only gripe with the build was the instructions got real vague for the last two Boyz, and a few parts seemed like they should go somewhere, but I couldn't find them listed anywhere in the instructions. Nothing showstopping, just a minor annoyance.