If you intend to sail with the genoa partly furled you definitely need a foam or rope luff insert.
Even with these the sail shape is not great when furled but it's definitely better than not having it.
The sail shape doesn't look too bad from the cockpit, but have a look at a yacht sailing behind you with a furled genoa and you'll see how baggy it is, whoich wehne the breeze gets up, is exactly what you don't want!
Cheers
Alan
Elyse SM437