Technique: I almost embarrased to play my series I at times. It exposes every single flaw in my technique, no matter how minor. Those same flaws are unnoticed on my jazz bass, and even my SCSD. End result? Alot more of my practice time happens on my series I because of that.
Other basses: It is very rare that I walk into a music store, pick up a bass, and get that I gotta have it feeling. Usually there is something lacking in tone or feel that just doesnt do it for me.
I also own a72 jazz and 64 jazz that is all original. Both sound good, but the 64 is simply the best sounding bass Ive ever played that is not an Alembic (and to be honest at times I prefer the sound of that bass over my Alembics). Its got a very dry, warm, and woody tone that I have yet to find in any mass produced bass