Synthetic corks do seem to cause problems down the road. I believe this is much of the problem with the early 2000's Behrens and Hitchcock wines that were so highly regarded by RMP that are now virtually undrinkable. I also think that I read Brian Loring say somewhere that the future problems is why he went from the black synthetic closure to screw cap.
Other wineries that use the glass stopper are Whitehall Lane and Sbragia. I believe that WHL only uses is on selected wines, and I do know that Sbragia only uses it on Sauvignon Blanc.