Mine have been replaced twice. Last time was about 4K miles ago. The shudder is just starting to come back.....again. It is still very faint but it's coming back like before. In another 6K miles or so it will be back to full strength if it if continues to get worse.
Unfortunately, the second replacement was supposedly with a revised cv/half shaft part that is thicker than the previous part.
Well that's a bummer to hear! Mine were just replaced a month ago, so hopefully it's the newer part and won't come back!