I just found out that Kiesel has a single humbucker headless model in production - the AW5 Amos Williams sig. I know @MojoPenguin has a (modified?) four string version - anyone else? I've been interested in a single HB version of the Vader for months, but back then single HB was a custom option that made it nonreturnable - I felt it was too much of a risk. Now that it's in the regular catalog and is subject to their usual conditions... I'm curious about the balance and the pickups/electronics. Is the passive mode usable? Will it run in passive if the batteries crap out? What else can you tell me to sway my decision? I have one sitting in my shopping cart, but I'm trying to be adult about this and do more research before pulling the trigger. I'm hoping one can be the spiritual successor to my old XM2A - I'd even consider spinning off my pair of Synapses for these.