Buzzroom ssSF does one thing and does it well. It’s the only free Windows VSTi SoundFont player I’m aware of that allows more than three simultaneous notes (it can play up to six) and has an amplifier envelope. As a result, it’s the only SoundFont player I use.
The GUI is functional without being particularly attractive. I don’t use any of the controls other than the envelope knobs, so I can’t comment on features like pitch bend, portamento, etc.
One quirk to be aware of is that the display doesn’t update to show the chosen sample until you play the first note. This may be an issue with SynthEdit rather than with ssSF specifically.
ssSF doesn’t have any documentation but doesn’t need it as it’s pretty self-explanatory. It doesn’t have any presets (that’s what the SoundFonts are for). I haven’t had to use customer support. I agree with other reviewers who’ve requested a “not applicable” option, but until that happens I’m giving ssSF a 10 for those categories.
EDIT (29 August 2004): Although ssSF sounds fine for some SoundFonts (including the one I was originally using it for) I now realize that it's noticeably inferior to sfz for others (e.g., a piano SF I use). This is almost certainly not the developer's fault (it's probably a SynthEdit issue). However, I'm now reducing the Sound rating from 10 to 6.