Well< just changing the oil fixed mine!
My wife has a 2006 GLI CVT with 95,000k. The shudder in ours developed over a couple of years and nearly got to the 'bad' stage. We had the family arguments, my wife (who's often right) insisted that the shudder was getting much worse every time she got in the car, and me insisting that it was about the same. A really steep hill start gave a 'bad' shudder though. After reading a lot of forums I decided to give an oil change a try, rather than fork out for the start clutch. I got my oil from Hi-Tec Oils in Sydney. It's labelled HONDA CVT fluid and I got 2off 4L containers. Local mechanic changed the oil without any flush. There was a slight shudder for a few weeks or so but after 'she who must be obeyed' drove to Cains and back it's back to new. That was about 2 years ago now and there is no sign of any shudder, even with very hard acceleration or steep hill starts. I was a bit dubious about using the Hi-Tec oil at first but now I think it might even be more suitable for the CVT than the HONDA stuff? I bought 8L of the oil at the time thinking that I might have to change the oil twice the get right result, but it cured the shudder with one change and now the other 4L is kicking around in my garage. Cost? About $40!