I like the comfort of my 2012 4004. In terms of feel, it is almost identical to my 2011 4003. Yes, the body contours are softer than the sharp binding of the 4003 but binding has never been an issue for me. Tonally, the 4004 is very different from my 4003. I do prefer the tone of my 4003 and 4001's to the 4004. Not that the 4004 is bad, it's simply different. i like it more now that I have Dane's VVT harness with coil tapping. The different value pots have made a bit more versatile, in my opinion, than stock. I don't have a ton of EQ options with my amplification. I use Orange products, which I'm real happy and comfortable with. I have no trouble getting the tone I'm happy with out of either my Orange rigs and any of my 4001, 4002, or 4003 basses. My 4004 needs different settings for it to shine as much as my other RIC basses.
I like the Schaller bridge and I agree with Joey that it would be perfect with the addition of a quick change string slot instead of "string through". I'm not a huge Schaller m4 tuner fan. Oh, i love they way they look but I think Gotoh Gb7's are a vastly superior tuner. And this is coming from a German.
Sepp
