The Durasurf stuff is actually a P-tex skin (just like a snowboard).
The '04's are def lighter. I have to agree they are slightly heavier than a similar size '04 board...but indestructible. (After breaking another board with a less-than-optimal "warrenty," not a bad trade-off at all)
Compared to a '03 not bad at all...friends picked my '04 125 at the beach recently and first comment was "Wow, light!" (clearly subjective, but hey, it happened.)
My dealer weighed them at:
"The 125 weighs 5.4 lbs with fins on. The 136 weighs 5.5. Add about 1.2 for straps/pads. I don't have a 115 to weigh at the moment, but probably about 5.0 lbs."
I don't own a scale, so I can't verify; just passing along as general information.
125 is fast and fun (I weigh 87 kg)