SASless said, After all the price costs of the advice here is quite reasonable.
How does that quote go? "Free advice is usually worth what you've paid for it"?
You're right SASless, filter the info, don't rely on it. I've learned quite a bit from this site, but could easily have been led astray.
As far as the A109 Engine Mode Switches, I'll be looking at them in a couple weeks so will have something more specific to say then. In general, they are supposed to balance the desire to autorotate without the engine providing power with the desire to have the engine come on line when you do need the power. I'd expect the manufacturer will have a convincing argument of why you'd want to use the "Engine Mode Switches".
Just my thoughts,