I have one on mine. Had two for a little while but the bass seems to have settled in.
Placement is key. I used the capo I have for setup work to find where the issue was, added a Fat Finger and was good. I put the other Fat Finger on my old Carvin LB70, which has the same issue, and it fixed it. Both basses are lightweights with non-laminated maple necks but differ substantially in every other regard: bolt on - neck through, maple fingerboard - ebony, etc.
FWIW, most of the StingRay 5 Specials I've played have a dead D instead of C on the G string. Some are more prominent than others. Of course, YMMV.
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