It all accords who you ask, those that own a particular turbine will tell you it spools up quicker than any specification suggests, one thing you can guarantee is that if it appears in a German specification every turbine will at least meet that specification if not better it, the reason is the trade descriptions act in Germany is very strict, advertised specifications must be achived at a minimum so they under specify to ensure compatabilty.

From my own experience the Graupner G Booster and JetCat SX turbines do spool up very quickly compared to others I have flown.

Hope that helps
Mike

EDIT: The P80 will spool up in about 5-6 seconds as suggested 9-10 seconds is off the mark.