I learned kitesurfing on the voodoo 10m, first upwind first jumps
It was a great kite at that time but today not even close performance wise to the new foil kites.
With only one front line it feelt very loose in the air I remember.
Since then I've been on arcs, tubes and now back to foils
For tubes C-style not so much progression in my opinion, I guess progression is mostly done in the bow style kites.
In fact some of the C-kites I've owed I liked more the older ones than the new ones and now I've understand
that the reason is that todays C-kites have evolved toward freestyle machines whereas the older top ones were mainly
freeride high ar kites, I might be wrong but that is how I understand it.
In short if you can afford it go for a new kite.
The high ar foils are great.