I was having sync problems with a retro-gaming-accessories composite-video-as-sync cable through both a Framemeister and an OSSC, but not my PVMs. Maybe this was due to the capacitor thing, based on what Voultar said. I switched to a PACKAPUNCH cable, and no more problems. There is some VERY FAINT, barely noticeable diagonal line noise through the OSSC, but it's not visible through the Framemeister or on a PVM. The only other video problem I'm having is jailbars, but that's the PCE itself and has nothing to do with the SSDS3. So far, I have yet to play a CD game where the SD card access buzzing is audible over the game music.
I have to agree with some of the other posters, that for some reason people's standards when it comes to stuff like this has just gotten completely insane. It's like it has to be perfection or nothing. I used to use one of those SNES floppy drive things. When Everdrives came out, I was blown away. Didn't matter that some games didn't work.
The SSDS3 is more than worth the asking price as it is now. If the buzzing thing gets mitigated or fixed completely, great. If not, live with it. It's like some of you don't remember what it was like playing games through an RF cable back in the day.