I have two 4004's and one 4003. I like both - the only reservation I had about the 4004's are that you probably need round wound strings on them unless you want a really boomy vintage sound all the time.
No personal experience, but I've read where other 4004 owners have stated that putting pots with proper specs in the harness will bring out the brightness. If (when!) I ever get a 4004 I'll definitely consider getting one of Dane's harnesses.
