What surgeon did your chin implant? Was it a reputable surgeon?
Do you have any current views on the safety of implant vs sliding genio, assuming you can be somewhat unbiased despite your own bad experience?
People are afraid of the "low grade" and "permanent" inflammation you supposedly get from your face forever trying to encapsulate the implant(s). I guess if your immune system gets really weak when you get really old, maybe an old implant can get infected and need to be taken out (and probably will leave you looking a lot worse at that age). They may also not 'age well' with your face, but I don't think that's very common when it comes to chin implants (imo). I can PM you the doc... but yes he is a 'reputable' surgeon (just not a big name doc).
If you are freaked by complications of an SG, then I would go with a silicone chin implant for its reversibility (depending on size and patient age) and typically zero permanent complications. Just don't goof and go with a doctor that doesn't do chin implant surgeries in his sleep. Same with SG if you're willing to gamble a bit more. It's a pretty safe bet that, all things equal, an SG will put you at more risk for complications, just by the nature of that surgery, vs an implant. BUT don't get a chin implant through the mouth, you're much better off with an SG if you *must* not have a scar under your chin. If you already have a mild to moderate labiomental fold though and need say 6mm+ advancement, then a chin implant will look stupid and shouldn't really be considered at that point. When I get around to posting my mug, surgery proposals from Gunson etc, you'll see what a 12mm chin implant looks like.
If I could do it all over again, all things considered, an SG with an elite doctor would have been the best all around option.