I have a 2-blade Martek folding prop on my Sabre 28, and I have nothing bad to say about it. The boat handles fine in forward and reverse, prop walk is minimal. Just make sure you keep it clean; barnacles will hamper the folding mechanism as well as significantly reducing the prop''s efficiency and your speed under way. If it''s old, consider removing it and having it serviced by a prop shop. I had mine rebuilt a couple years ago: they replaced the hinge pin and refinished it and it looked brand-new when it came back.