I think my Thumb NT weighed a little over 12 lbs, and it felt like 9 of those 12 lbs were in the headstock.
Here's a picture of me playing it...
I'm not actually singing here... I'm screaming because of the cramp in my shoulder.
Seriously, though... the Thumb bass was my DREAM bass... I had a picture of one hanging in my locker, my senior year in high school.
When I landed a fairly crappy endorsement deal with Warwick through Dana B Goods, I was in heaven. I got that bass and played it almost non-stop for 3 years straight. I literally didn't even touch a different bass... recorded a bunch with it... and I thought I was in love, but I eventually realized that I was suffering from abusive relationship syndrome. The bass was slowly beating me to death, but I kept coming back for more.
Honestly, I think my deep, deep love for it blinded me to the many problems it had... and there were lots. I would never own one again.
As far as the differences between BO and NT... to me it's always looked like the BO model's body is all stretched out... Or am I crazy
BO
NT
I'm assuming that must have something to do with how they feel and balance... but I've never played a BO, so I wouldn't be able to compare.