M_Boats: Roller Furling

Wrinkle Boat Mates I am in the processing of researching a Harken Furler #434 Lo Load 500 lbs, @ $316 vs #435 Hi Load 950 lbs @ $365. Max wire size 1/8 inch on both Q 1. Is the Lo Load sufficient on a M15? Q 2. Is the extra $49 for a Hi Load worth it? George "We Can Not Control the Wind But We Can Adjust Our Sails"