I've messed with all four heads on Sanctuary enough to earn the title Potty Queen!, in my opinion - not something I particularly saw coming, but I've done it all from replacing a toilet seat to rebuilding the insides of the holding tank (dip tube)...and everything in between including total re-hosing of the whole boat. So, I'll throw my vote in the hat since feel qualified to cast such a vote.
I have a combo of GalleyMaid and Vacuflush at the present time. Vacuflush, by far, is my choice. Ironically, the VF seems to be my friends' and guests' favorite toilets to use, too. The only noise is the initial breaking of the vacuum seal when you flush, but I find that less annoying than the noise of the GM pumps. My neighbor has something like Crown or Raritan and when I first pushed the button to flush those, the noise startled me - sounded like there was a coat hanger in there.
My GalleyMaids have begun to stink a bit now that the water is warm and it's hot here. Those use saltwater to flush, and a whole lot of it! Not my VF, though - they use fresh water to flush and just a tiny bit. Those two VFs are on my smaller tank, too. Once I get rid of the two GalleyMaids and put in VFs in their place, I'll probably be able to go 6 weeks between pumpout, and I'm a liveaboard. Granted, I do have quite a bit of tankage.
I haven't had the VFs installed long enough to say how trouble free they are or not. I can tell you I've had them troublefree for about 2 years now. The GMs have been more work than care to do and they are beasts. I just cringe when I have to do anything with them, even the simple task of getting a spare pump out of the dock box when one needs rebuilding.