First-hand experience of tuned 3.0 TDI?

After checking the net for the new 3.0 TDI tuning potencial I came across Tunig-Box, who offer 282PS and 680Nm torque for the A6 engine, and another
German - apparently more serious tuner, offering only 260 PS and 500Nm torque figures.
It seems to me that given the fact this is only available with Tiptronic, 680Nm is a sure recipe for disaster. What do you think the rest of you? Anyone with hands-on experience?
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