KTM-PHDS gets a thumbs up from me.
I ran PHDS on my 2011, no issues, used appropriately sized allen head bolts through top clamp. Expensive but really great product. Very noticable difference in reducing vibration and absorbing small hack. Ive since gone to Flexx bars which are basically the balls. For me, similar to running a Rekluse or a steering damper, once you go down the path and get used to the benefits, I cant see not running Flexx bars on future bikes.