I can't speak for StuartV, but I can speak for me. I am a Carvin fan and I love my AC50, BUT there is a reason I own 3.5 six string SX basses and not one Carvin. The first being that I have 3.5 basses not one! Yep, fretless, rounds and flats. Ash and Alder. All different All killer. The next is Carvin basses are modern and quite frankly I've never been impressed with Carvin 6ers (until the Vanquish). Sterile tone. Pointy headstocks. Ho hum look to balance great fit and finish. And even though the Vanquish is obviously (from video) one killer bass for the bucks, I've got plenty like that. Got a Modulus Q6, got a Modulus TBX, got a Ken Smith 6er, got an Alembic fretless 6er. All killer. All modern. All two band. Even some active/passive. All expensive.
My question started with the Fender Steve Bailey back before they discontinued it. And that question would be is a six string Fender jazz Steve Bailey bass something or not? So how to find out? Well one could buy a Steve Bailey if you could find one or go whole hog and get a Low End.
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(Picture is actually 5 string, but you can order it in 6 string)
Wow! Look at that. There is a TOTALLY cool Fender clone 6er to find out if it is something or not. Totally traditional. Totally well made. Totally total. Just one minor problem. Not $1500 but costs $3,300! How much money does 3.5 of those add up to? And I'd have to pay it BEFORE I found out if a Fender Jazz 6er made sense (Obviously Fender doesn't think so!).
Sure so maybe StuartV got some more expensive upgrades than what I did, but they obviously are going to give him what he wants just as mine gave me what I was looking for for less. And while the Vanquish is a very impressive bass to me, it was not the question I was looking to answer.
And by the way, the answer is Yes, a Fender-clone 6 string bass IS SOMETHING! So, yes, now I do have the information so I could fork out for a nice Low End bass and not worry about what it might do for me. But in the meanwhile, My SX 6ers are doing just fine.
And there is one more point that I know very well. And that is once you've forked out a couple of grand for a bass, you are VERY reluctant to start ripping things off it and drilling holes in it to try ideas that you think might make it better! A $200 bass....not so much.