To all who are considering a roller furler, I added a CDI roller furler last year to my M17 and am quite happy with it. The CDI design seems to be bullet-proof. I have had no problems whatsoever. My wife loves that she no longer needs to go forward to perform sail handling duties and I must admit that I too enjoy the convenience as well as the safety of it. Mike Leonard wrote a nice article detailing his selection and installation of a CDI furler which is on the MSOG site (under How to and specs/Specifications, weights and measures. I chose to go with a 135% Genoa in a heavier cloth since I sail in winds over 20 knots fairly often and I didn't want to stretch out a lighter sail that was rolled up to storm jib size. I was planning to purchase a lighter 150% genoa later and choose my sail for the day at the dock. It's very easy to change sails on the CDI furler. We like it and that's my 2 cents worth on the subject. Mark and Roberta Dvorscak M17 #400 Grace