Koa can be some really special wood. Sometimes it's got wild flame figuring, sometimes just plain bland. Rob's bass here, has a lot of that *wow* factor. Thing about koa; it's also got some really cool resonant properties. I've never had an Alembic bass or guitar with any of it (though I did wonder if #621 might be koa-topped for a while) but having played a number of guitars made of it, I can tell you, it certainly has a unique voice. Can't really compare it to anything else.
This one's mighty sweet, Rob. You should pose it with 75-A013 "Smitty" for the Koa family photo sometime.
~Gregory (who thinks that #76-449 needs a Hawaiian name...)