I had a Gibson Angus Young sig SG for a few years. Bought it because they look cool, unique color with the lyre vibrola and 69 look, pickups sound great and it was the cheapest way to get all that in a Gibson SG. I was hoping it would increase in Value but I broke even when I recently sold it to pay bills and fund some parts for a new tele. Most of the signature guitars I have seen offer unique things that usually justify the slight upcharge. Guitars like the Robert Cray hardtail, Kotzen Tele for contour body, fat neck and pickups, Angus SG, Warren Haynes Les Paul for no nibs, neck shape and switch mods, Trucks SG for the 60's look and faux vibrola all offer cool specs that justify the purchase imo. Maybe not for new prices but certainly on the used market for a good deal.