Thanks Darryl, that has swayed my opinion some....

I do still not like the idea of the rudders catching weed though. Most places we sail, weed is really a problem. Forster is a problem and will see how they go there. As you said, the problem may not be enough to justify dismissing them. There is obviously a potential problem there, that those developing the systems will or may have already have looked into. A solution may be found, or it may be just a case of bearing with this disadvantage whilst gaining advantages else where.

Look forward to watching the continued development and see if bigger classes start experimenting with them too. Wouters comment about boat size does have me intrigued.