I've got them on both of my J's. It's my favorite grip for the J's. I've used lots of grips over the years and prefer these for using. I like the slightly sticky feel. It helps hold them when in my waistband. Cheap as well.
DO NOT use them on blued Js! I did. My frames rusted. They form and hold condensation from environmental changes. I stopped using Hogue grips completely, especially their Monogrips. YMMV