I know people with both the FZ1 and FZ6, who love them. So I tested one (the FZ6) at Biketoberfest.
Nuh uh.... 30 minute ride, and it was scratched off the maybe-list forever.
Throttle response was like an on-off switch... FINE when you're trying to take off from a stop, but NOT so fine when you just wanna roll off a bit to slow down a tad. It was very lurchy, making maneuvering around at low speeds (i.e. in a parking lot) very sketchy.
And the vibrations in the seat?
My tushie, inner thighs and *ahem* parts were numb for about an hour afterward (the guy behind me no the FZ1 reported the same problem).
It IS a seriously comfortable bike.... almost TOO upright for my tastes, but great position for commuting.
Like GR said, see if you can test one out... you might not encounter the vibration problem, and it might suit you fine, but I'd say look at the SV650S or SV1000 as well. Equally comfortable, and just overall superior bikes in my opinion.