Here is a picture of the F17 with wing mast and jib kit:

When I bought my Inter 17Rs and F17, they had the carbon mast. With the new wing mast, the price runs about $3000 US less than the F16s here in the US, from what I can find out. I have moved on from cat sailing, but having raced lots of single-handed cats since 1985 (18 Square, N5.5 Uni, A Class, F17), I loved the F17 best! The A Class was really fun upwind, frustrating downwind, fragile and a pain in the butt on the beach. It is so light, you cannot leave it unattended without dropping the sail and tying it down. The F17 could just be put into the wind, unhook the mainsheet and left. If I return to cat racing, it will be on the F17.