Is the extra $ worth the weight saving and extra stiffness? Is it about the stiffness?
I can't really comment on the Epic skis because I haven't paddled them long enough to compare, but I can tell you my experience with the Fenn Mako6.
I bought a carbon ski (11.5kg) and broke it in waves at the first ARB World Cup in Durban, South Africa. After it was repaired I bought a glass ski (which turned out to 18kg) - the idea was to use it for training and social paddling and only to use the carbon one for races...
But I find the carbon ski such a pleasure to paddle compared to the glass version that I've hardly used the glass one - although I find it useful to have it on hand for visitors or friends who need to borrow it!
What's the difference? It may well be all in the mind, but I believe that the lighter ski accelerates more easily and that it just feels livelier and more responsive on the water. I think it's a combination of the 4.5kg difference, the added stiffness and perhaps a dollup of mindset!
I'd say, if you can afford it - go for the Ultra!
Rob
Currently Epic V10 Elite, Epic V10 Double.
Previously: Swordfish S, Evo II, Carbonology Zest, Fenn Swordfish, Epic V10, Fenn Elite, Red7 Surf70 Pro, Epic V10 Sport, Genius Blu, Kayak Centre Zeplin, Fenn Mako6, Custom Kayaks ICON, Brian's Kayaks Molokai, Brian's Kayaks Wedge and several others...