I sail a M6.0 XL and don't know anything about fragile. I've broken a rudder casting in the surf in Daytona. But you'd expect that when the darn thing locks down before you've cleared the sandbar. Nothing else in 3 years.

The larger spin will be nice on a deep run but the smaller spins are definitely more popular now because you can carry them higher and faster.

I have had rudder problems. The adjustment nut on the top just won't hold them under far enough. If I brush the bottom or put to much pressure on, I get wicked weather helm. I've corrected that problem with shock cord wrapped around the rudder and casting a few times. No problems since I started using the shock cord.

The biggest problem you'll have is class racing. There's not enough of them around to make a class so your always in the open class or distance racing on it. If you want any more info send me a PM.