I’ve had three sig basses, Fender Dee Dee, Mike Dirnt & Duff McKagan. All were very good, well made, played well and sounded as they should have, easy to coax the famed tones from them. But ultimately I preferred the regular US Fender Standard Precisions.
I wouldn’t slate someone for using a sig model in a band that didn’t do any of the sig-persons material, I’d just think they’d chosen the best instrument for themselves.