I am the proud owner of a 04 450 EXC, I just came off a KLX 300 which was a great trail bike. This bike has the most amazing power, never over powering, always as much as needed when it is needed. It does not feel scary fast or try to pull my arms out when I accelerate, just pulls and pulls. It is deceptively fast. I am a faster rider on this bike with a lot less effort. The handling is like nothing else I have riden, ride it hard and it feels better, putt and it feels great. It is heavy but never feels it on the trail and it will do anything I ask it to.
I ride with my son and friends so various speeds and love the single track where this bike shiines, it is flickable. Go to KTMtalk.com and ask them their opinions, great folks.
It adjusts to my style, I do not have to adjust to it's style of riding. Like others I suggest you ride one if you can and get you name on the list as quick as you can. Then buy orange gear, paint the truck, the wife, the dog, the kids orange and go riding.
Tim