Artist's Equipment

Are we supposed to be listing gear that the artist in question has actually used, or is a signature series enough? My assumption thus far has been that we are looking for gear they actually used, which has led to several "needs improvement" tags being added to various Dimebag models produced after his death. Even the Razorback technically wouldn't meet the standard of "used by the artist", though I have left that one alone because he was the co-designer.