If I can weigh in as one who buy custom basses. You do get what you pay for, and because of the cost you need to make sure that what you get is what you want.
I say that because I have had an F Bass BN5, Valenti J5 #20, Roscoe SKB 3006, Sadowsky MV5, Skjold EC5, all fine instument and there was something about each that I loved or could live without, but ultimately may not have matched the tone I was hearing in my head. Now these basses are expensive but they all hold a very good resale value, which makes it easy to buy sell and trade, I am also writting this in hopes that some of you will not have to go through the process I have gone through to fine the bass with the tone and feel that's you. There is a story behind all these aquisitions. The F Bass I thought I would never get rid of, but I wanted a sixer so it went for the Roscoe, the Valenti went for the Sadowsky, the Skjold (my bigest regret) went for my MTD 535 (yea I still have it) the Roscoe SKB 3006 went for a MTD 635/24 that went for yet another MTD 635/24 with different wood combinations. So as of today I have two MTD's in the house a 535 and a 635/24 I sold everything else because I have 3 custom basses being built. Two Skjold one a J5 and the other a fretless P/J 5 and a Nordstrand JJ/PJ with swappable neck pickups a couple of pickguards, and I believe I am done. The MTD's deliver my tone and the feel for me is phenominal, the Skjold's well you would just have to play one to understand, and the Nordstrand is traditional jazz bass. The thing about the custom is that you pick your wood combinations number of frets type of frets, for the fretless lined or unlined you choose the pickups, (but most of them are custom as well) the preamp active or passive, matching headstock or not, bridge, tuners, de-tuner that's custom. I talk with Pete Skjold on the phone for hours, Mike Tobias, I can call him on his cell phone. Carey Nordstrand's shop is only miles away he'll say come by the shop. I have all kinds of pictures of my basses being build. There's a documentry on Mike Tobias, here are some teasers for you MTD fans
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There are shots there of my bass (the one in my avatar & below) at the 20-21 sec point which was completed in April. All in all custom shop outside of being hand built and finely crafted by some of the best luthier's on the planet, is also very personal, who can I talk to about my bass at Fender would they say yea i remember that one, or Yamaha, lakeland, they all have built great instuments, but for me custom shop is the way to go. I played bass for years then played keys for 15 years in church (my first instrument) I would buy a keyboard and pay anywhere from $1500-$4500 three years go buy and the keyboard is worth $400. My MTD's will not loose value, it's an instrument and an investment. BTW, this is IMHO and you may fell that you could buy a MIM Fender put a Sadowsky pre in it some Nordstrand pickups dress the frets and call it custom YMMV, as for me custom baby!
This is Bob he is doing the video on Mike Tobias, he worked for and with Mike for years, along with my MTD 635/24
Also an in process pic of my Spalted Maple/Mahogany/Ebony Skjold Lions Pride Fretless PJ5
My Skjold lions Pride J5 Maple Burl/Ash/Ash/Maple. Waiting on Nordy pics.
Finally a Photoshop mock up of a completed Skjold "Lions Pride"