More than years few now. I purchased it I believe in 2007 from a guy in Colorado. It looks a little different but does a great job preventing neck dive regardless of the position in which one plays. On the other hand, I've spoken with a number of other distillantes over the past several years and only one of them ever mentioned having a problem with neck dive.
I hate to sell the thing but in the last three months I had a custom Signature Deluxe built and just accepted delivery of the late Tim Bucher's short scale, highly customized, Signature standard that he purchased from Will Gunn which Jazzyvee pointed out to me.