This F-one Strike 4.2 has been used in a school and demo setting.  Has had valve and hose replacement between strut and leading edge.  Overall in a great shape.

Info from F-One on this model:

• Impressive stability and balance
• Easy planing and performances
• Extra comfortable and light
• Huge wind range
• Incredible upwind abilities
• Fantastic jumping capabilities
• Light and stable for perfect freefly sensations