I do a lot of experimentation with my own boat. It currently has Hayn Hi-Mods, Norseman's and Sta-Loc's. My preference order based on installing and using all three..Based on my research the Hayn Hi Mods are the winner. Easier to use than Noresman and Stalok, equal or better quality and less expensive apparently.
http://www.hayn.com/marine/rigging/himod.html