With regard to open nets as tramps I like to add my experience with this because I use an open net already for three year.
Never a "normal" tramp again for me; I like it and I love it. For me it is the right solution for coping better with incoming break and waves.
See for that
http://www.youtube.com/watch?v=R9dcmhmlk4E&feature=channelBut you need to use the right open net!
No knotted fishing nets etc. They hurt on your knees.
I ordered mine with Sunrise Yacht Products (multihullnets.com) and they custom made for me from polyester rope with holes of 1-1/2", treated for UV and finished with a rope border which I could lace very easy (lacing gap 2-1/2") to the hulls and the beams.
Don't forget the net is WOVEN, not knotted.
In the trapeze you don't bother for the water which strikes through the net. I would say it enhances your feeling with the sea and your sailing!