I have owned a Fenn Mako 6, an Elite and now an Elite SL, all in carbon. In my view the Elite is the pick of the above 3 skis, it steers the best and has the best speed/stability ratio. I fit into it very comfortably and it is a nice snug fit (I'm 89kg and 1.85m) Downwind performance is great and it tracks nicely on the runs.
Carbon Fenns are solid skis and can take heavy surf conditions without problems, but like all carbon skis you have to watch out for impact damage on sharp objects. My Elite is still going strong after 4 years of offshore racing in surf conditions, and I didn't give it any special care or treatment.
Can't comment on the carbon V10, sorry!