I've been testing the New Peter Lynn Swell in South Africa over the last 2 months and have really been enjoying the wave riding with this kite.
I wrote a little blog on the photo shoots that took place:http://www.cannonrocks.com/blog/shooting-the-swell/
In 30-35 knots I would take the 6m or 5m out. 5m takes a loooot of wind.
I suggest you contact the guys at Peter Lynn and get a demo organized. http://peterlynn.com
Would love to hear what you think of it if you do try it.