well you pays your money & takes your choice.
you could argue that vw don't make the parts anyway, they are probably gates belts in a nice vw box. The vw stuff has 2year guarentee independantly from AMD guarentee of workmanship. But if it snapped
which one would own up ?
So i think it comes down to money & piece of mind. If moneys tight the AMD web price of £312 is incredible. But i'm not brave enough to try it, having had cambelt/garage nightmares before on my MK4.
Its the vw dealer for me from now on, especially as they will price match within 5miles