Nick, my mistake they are indeed around 580 grams per section not 450 on their stock tapered 50 OD x 2m pole sections.
Anyhow all the same I've found them to be cheap, very strong, ridged and easy to use so am very happy using them even on taller work no probs.
I also think price, weight vs longevity is a trade off so would not go for the lightest guttervac poles myself as would want them to last and not break on me. Not to mention there is a higher risk of electrocution using 100% carbon poles on their own.
I'm sure you will disagree but I think 60-40 hybrid poles are better suited for gutter clearing work than using 100% carbon poles myself.