I own an early Killer B. It is without a doubt, one of the best playing/sounding basses I've ever owned or played. Many folks express opinions based on hearsay, or personal bias rather than actual experience. I play with many different musicians, many of whom are outstanding bass players also. We all enjoy checking out each others gear, and to the last, every bass player I know who has played my Killer B has liked it. I have also played other newer Tobias basses at local retailers and was so impressed it prompted me to buy the one I currently own.
The Killer B was introduced, by Gibson, as a bolt-on style bass, equipped similarly to the Basic model. More expensive than the Growler and Renegade's but less expensive than the Classic's and Basics.
Tonally I'm still finding new variations, there is seemingly no end to the possibilities. I currently have mine strung up with medium gauge nickel Elixirs. I like how long they last and am eager to try the new stainless steel sets.
Currently Killer B's go for around 850-1200 used. And are a steal at that.