M_Boats: Cruising spinnaker

Hello fellow sailors, We are totally snowbound up here in the Inland Northwest (40 inches of snow in 3 days last week) and sailing season is far away, so naturally, sailing is foremost in my dreams. Specifically, a new cruising spinnaker. I have a CDI roller furler, with a 150 genoa, which is a little too heavy for a lot of the light air sailing we get around here. I've heard of a drifter/cruising spinnaker design built to work over a furled sail with a bead-loop system of raising and lowering. Has anyone out there had any experience with this, or care to comment on the merits, or "de-merits" thereof? Thanks, Larry Yake M17 #200 Tullamore