I found this info for the 2011 ZX-10R:
Steering damper is shit. If the [stock] steering damper is replaced/modded, the steering damper bracket is shit and cant handle it. (could try a GPR if it is a problem?)
Front brakes are spongy - Brembo mastercyl + braided lines can fix it to some degree, if you ditch the ABS all together and do these mods they are much better.
Stock muffler looks shit and does nothing, you can take it off and it will do zero to your noise emission, need to get rid of the 40kg catalytic converter to get some noise out of them.
They don't even need the steering damper to be honest, definitely not for the road. You can get them revalved if you think you need it for about $70.
By no means am i saying i' am a pro at riding, but the zx10r was the most user friendly for me. thru the twisties the suspension will give you the confidence to push through it, the brakes for the street i find them ideal, but if you're hitting the track more often than the streets, then i would be spending some money on them.
The bike is comfortable to ride, i do find after 4+ hours of continous riding, the standard seat can become a little painfull, but not like your riding 4+ hours everytime you take it out.
I test rode multiples bikes at the start of the month, then i rode them all again 4 weeks later, the zx10r came out in top each time. always had the biggest smile when coming back to the shop.