As a regular on here and Club Touareg, I haven't heard of anyone who has tried this product. While it looks like it should work, a rebuilt unit is less expensive but a bit more time consuming to install. Until they gets a bunch of them in the field with regular users, I would be hesitant. I put a rebuilt unit on my Touareg by myself this past winter. Perhaps if they were less expensive than the rebuilt unit I would have tried it.
As for the longevity of the product, how much longer will your daughter keep an 8 year old car?
EDIT: Looking on Club Touareg, I see there are several users who have used the product and it worked for them. One who said it didn't solve his problem. I think part of the issue is that you don't always know whether it is the rubber alone that failed or whether the bearing failed, causing heat and making the rubber fail too. The Vertex product doesn't replace the bearing. It only replaces the rubber. If the bearing is bad, then you are still left with a bad driveshaft.