"sometimes good but only if in the realm of believability"?
might fall under "only good if i can't tell," since i'm p sure implants are usually fairly obvious?
If they look better (subjective), they're better. So I'm in favour of changing them, if someone feels like it. But they could be bigger or smaller. Or just different. I can't respond with the answers provided.
It's interesting how the 'all boobs are good' no-shaming movement has taken off simultaneously with the 'fake boobs are bad' shaming movement and the significant overlap between them.