Last year I also replaced the dogbone on my TDI with a Polo unit looking just like the one in the photo from TDIaholic, as in it was a little thinner then the original. It lasted just over 6 month before it broke in half right at the thinnest part of the arm. One of the bolts in the mounting plate had worked itself out which probably caused extra strain on the dogbone itself, but I was still very surprised to see that cast aluminum had simply broken in two.
So I ordered another one, but this time for a Skoda Fabia TDI. On photos it looked identical but when I did a side by side comparison to the broken Polo unit I could see that the Fabia one was much beefier on the arm between the two mounting holes. I can't remember for sure, but I think it was a Febi unit. Anyway, with the new beefier Fabia dogbone mounted, it felt stronger and completely eliminated the sligth vibration/rocking sensation when releasing the clutch in first gear. So now I have a nice and smooth take off in first and no rocking feeling when getting on and off the throttle.
Just my experience.. Alex.