I've had Kury grips on my RK. I've really like them. The stock HD grips, in my opinion, are too lightweight to make fine adjustments in throttle response. The Kury grips are heavier and give me a much better feel for the electronic throttle.
Used the SAC grips on both of my Ultras. Love the leather feel and the larger diameter. Can get them in about 250 styles and colors. If you go to Daytona they have a trailer and you can see them all or go to www.coolsac.com. Best I have found so far and a breeze to change on the TBW.
For my 09, so far I've bought the HD Chrome and Rubber (large) grips, and the Kuryakyn Iso's. I definately didn't like the feel of the Chrone and Rubber ones; they hurt my hands immediately....
That's strange. The chrome and rubber grips are my favorite ones. I've put them on my last three bikes.
BTW, my dealer told me that they were Harley's first optional grip offering.
You can use any metric grip you like. Cut the rubber off and reuse the sleeve on the throttle side. I used the metric ISO grips on mine before they came out with a set that fit the 08s and they are still working perfectly.