With the Lord of Pestilence, I'm very impressed. Very multi-layeref; for instance when you look at some of his wounds you can see layers of skin, then some mechanical gubbins, etc. Very nice.
Almost hated to mod him, but he just called out for a jump pack. I think he'd look silly with wings.
Soon I'll be getting their other daemon prince, the Plaguedaemon. First though I think I'll grab their Great Unclean One if I can get my hands on it. They stopped producing it I believe.