Well, I can't tell you if it's worth extra or not, I can only give you information on how well the heat pipe works. The MB Temps never get higher than 39C, on an overclock 3700 San Diego @ 2.8GHz A 1.55V.
It must run quiter than the deluxe model since there is no fan, I never owned a deluxe model. I wouldn't probably hear it over my delta fan if I did.
The board has been solid performer for me. If you own a 3700 San Diego, your max OC would be limited to 2.8GHz. The 3700 SD will clock higher, but you would need volts around 1.6 range, and the board maxes out at 1.55V. That's fine for me cause I would not feel comfortable running it over 1.55v.