I have had the Ambassador rope stripper for two years, and its been really effective. Best to decide whether you will stick with the two blade prop for many years before you buy - the stripper is specific to the number of prop blades.
well, I know beacuse someone ( /forums/images/graemlins/mad.gif) left one of my 24 mm mooring lines dangling overboard, and the Stripper just sliced through it. Well, shortening the mooring line was much less expensive than the previous damage of a rope around the saildrive!!
Three cheers fro Ambassador (but it is not cheap, it cost half as much as the Kiwiprop)....