I've had a few signature basses over the years but all entirely coincidentally and purchased as they were fantastic instruments in their own right. The sig designation neither turns me on or off, if it's a great instrument that fits my needs, then I'm happy with whatever it might say somewhere on the bass or the accompanying documentation. I have a couple at the moment, a Stanley Clarke and a Wilcock Mullarkey: both outstanding shorties and neither with any kind of identifying logo (not that it would really bother me). Neither with any kind of price premium either as far as I know, though both were bought used. I might hesitate to buy a price-hiked sig bass that was no different/better than its 'standard' counterpart.