Great to read through the feedback and interesting to hear the different opinions on the Vector fins.
I though it would be helpful to post a photo that shows the difference on the fins mentioned in this thread (Vector Rockit, Canefire, EX and Volt) and shortly "sum up" on what the different design delivers / or what we recommend them for.
Rockit: This is one of longest running Vector designs. Simple outline that deliver a "all - round" performance for all conditions. Excellent control and top end speed as pointed out by other riders on this forum thread. Will fit most boards. Modern as old style.
We mostly recommend 28cm - 38cm sizes.
Canefire: Got a lot of development when the boards started to get wider and shorter. The straight leading edge and positive curved trailing edge together with the slightly wider tip section, making sure to deliver a lifty fin, that will get the wider tail boards up and going. Great for flatter to small choppy water conditions. Great on the upwind performance.
We mostly recommend 34cm - 46cm.
EX: This is the fins with the most control. It will keep the nose of the board down. Will work great for lighter riders as well or sailors that want to keep the board very flat and sailing mostly down wind. The fin is more swept back for control. Also "older style" slalom boards with a narrower tail will like those fins.
We mostly recommend 28cm -36cm sizes.
Volt: This is our newer design developed for PWA slalom. We recommend all sizes from 28cm - 48cm. The wider base section will deliver acceleration and grip. The slightly swept back profile will keep you board in control at top speed. Concave in the trailing edge makes them very slippery through the water. For racing, acceleration, jibing, top end speed and control, those fins are a winner.
We recommend all sizes from 28cm - 48cm. Sizes from 40cm and up is a tuned up design that deliver stiffness comparable with some carbon fins.
The above is a guide line. Factors as sailor level, boards, sails, rider weight / size and sailing conditions all plays in when choosing the right fin.