Anyone using the Intel Core 2 Quad Q9650?

I've had the Intel Core 2 Quad Q6600 2.4Ghz (OC'd to 3Ghz) for just over a year now, and have been pretty happy with it, but it's getting kind of dated and I have been wanting to see the difference with the 9650.

I've heard of people running the 9650 @ 4Ghz with stock cooling.

Thoughts?