I've been able to spend a month with my '08 FZ1 and am really enjoying it. I had read about the suspension being poor, mid and low end power isn't great and the throttle snatch issue. I guess a lot of it has to do with what you have to reference your bike to. I'm coming off a 1981 Yamaha Seca 550. 50 HP when it was new and about 23 ft/lbs torque.
Let me tell you, the FZ1 has a ton of torque anywhere. The suspension is just fine by my standards. I was able to detect the throttle snatch issue but I can't ever see where my type of riding would lead it to be an issue. Fact is that, living on the prairies, I see 1,000 miles of flat straight road for every mile of corners.
I've seen ride reports where guys will frequently top 100 MPH on the GPS as the top speed registered for the trip. I did question why guys were hitting these speeds but now I know that it is so damn easy to walk on the throttle when you hit the highway and bounce through the gears to 100 MPH or better! : oops:
Sitting on the old Seca still feels good. The seat is comfy and the bars drop right to where your hands feel they should be. I can see a set of 1" bar risers in the FZ's future. Might spring for a touring windshield as well. The wind on both bikes hits me about mid helmet but the Seca has a little flip to the top of the windscreen and it causes quite a bit of buffeting. The FZ is totally smooth in comparison.
My point to all of this is: the stock FZ platform is an awesome bike! Depending on your needs and experience it can be modified to make it even better but when you are moving 27 years into the future, it's pretty freaking sweet!
PS. I did the retro kit just to keep the look of the old Seca, which will be handed over to my son.