Alex at MTBTandems has a photo of him and his wife airborne on their website. I think that's on their Ventana, which is a full suspension, if I recall correctly. We've got a 5 inch fork up front, and it does a really good job. I don't think you can compare a tandem FS to a single FS. I certainly wouldn't mind a full suspension frame with the daVinci independent pedalling, a Rohloff hub, and a titanium frame with S&S couplers.