It really changed my perspective on things. There are a couple dozen people there who design, assemble, inspect and repair everything right there in that little shop. Sure, you can get a reproduction Korg MS-20 for $600, but there was something charming about seeing exactly who puts together a Moog Voyager or Sub 37 - the latter of which I pre-ordered this year, and I never pre-order anything.
It's well worth seeing if you're ever in Asheville - but the tour is typically only open during the week, during regular business hours.