The Fazer 8 is indeed an excellent bike. The only thing I found dislikeable was the standard exhaust, far too quiet.
For me, I went with suspension upgrades front (Andriani) and rear (Nitron) (personal preference) K&N filter, scorpion serkit silencer (works better with db killer) +10mm higher bars and a gel seat insert.
150 miles to a tank, plenty of torque and goes ballistic at 7k and comfortable enough for a 400 mile day, what more do you need.