Personnally I'm very happy with the Landerberger mainsail. We have a great speed upwind. The jib however is a little to full to my opinion. We could sail higher with a different jib.

Downwind is a different story. The spinshape is quite full. You have to sail it deep for optimum performance. So deep there is not enough lift to get a hull our of the water and chances on pitchpoling are bigger. We I head up to get the hull out of the water our speed remains the same, but we cover more distance.

Any other views?

Gill