If it appears 'to good to be true', is probably is.
If I am not mistaken, the power puck just increases fuel rail pressure to get the gains they call for.
I would go for an ECU HOT tune from GDE (Green diesel engineering) the most common ECU tune here, or there is Custom Spooling, out of the UK or Inmotion Tuneing.
Yes, they all will cost you about double what the puck is worth, but give you so, so, much more in performance. Also, GDE eliminates the swirl motor issue that is common to the CRD.
Search for GDE tune on the forum and lots will come up about it.
2008 CRD QDII, OME HD, Pintlers wheels with 265/70/17 Goodyear Silent Armour's, Jeepinbyal UCA's. 4XGuard Front guard, Side Guard, belly guard, Matrix HC. GDE ECO Tune w/ delete.