I downloaded the one in .rar format, and I would have
to say
that it's rating is not justified.
If you're after the truly authentic Hammond sound, any soundfont or
sample is likely to disapoint. Unless you've got a Leslie speaker on
your Linux box, maybe? : )
There is another soundfont on that page marked OB-3, plus a Farfisa
soundfont. There is also a second page of soundfonts if you click at
the end of that page. I don't think they are bad for free-as-in-beer
samples.
Cheers
Daniel