This is a great sounding pickup in a Martin HD-28.  But I was too retarded to figure out that to install it in my guitar.  There is a black plastic spacer that needs to be removed from the endpin jack threads.  The spacer is there for using it without installing it permanently but the jack won't fit in the guitar endpin hole with the spacer in place.  So I contacted Fishman about this issue and they stuck with me through email until I figured it out.  I give strong appreciation for the good customer service.  But as for the pickup, this sounds fantastic.  Clear, bright, balanced.  Better than the passive PRO NEO version which I also tried before getting this.  Definitely worth the extra money.