Enjoy it! I've had 7 450R/ER's through the years. Going to go ahead and warn you to put a kickstart kit on with it or one day the starter WILL leave you stranded. I raced mine in GNCC, SORCS, The Heartland Challenge, and some Mid-East races through the years, bulletproof bikes.
An HRC kit REALLY wakes up the 06+'s. HRC kit + a GOOD pipe (HMF, Rossier, DASA, MXP) + Good filter w/ no lid + Rejet and you'll have a completely new machine.
Hit up DeRisi Racing for some shock work if you want it to ride like a Cadillac. Tell him Zach Taylor sent you, he'll treat you right. His revalves are the best I've ridden as far as a stock bodied shock goes.