Didn't know about the aged wood...good to know.
The Pentabuzz was always the epitome of a fretless sound in my mind (messed around with one about 30 years ago), with Mark Egan being one of my all-time favorites.
I only started playing bass a few years ago and actually picked up my dream fretless (yep, a PB). Funny thing is, in those few years my taste in a fretless tone has changed to the more organic and rich tones offered by uncoated ebony.
I absolutely love the tones my zebrawood Thunder produces. I have several basses and switch them up on a pretty regular basis. And they all sound great.
But whenever I return to the Thunderbass, I fall in love all over again. I picked up a matching TB (same year, too, 2007) about a year or so ago locally with the purpose of turning it into a fretless. Haven't got around to making that happen yet.
I have bought a bunch of basses in the time I've been playing with the intention of finding just one (or maybe two) and selling off the rest. Right now, I'm a collector, and I really don't want to be.
I've got a new bass inbound, having bought it with a "This just might be the one" mentality. I think it will be a fantastic instrument but...we'll see.
I only wish my TBs were 17.5 rather than the 19.