Actually
AFAIK, the "Bell Subsidiary" picked up the SAGEM/SFIM STC as part of the package deal when HAS went bankrupt (i.e. they didn't specifically go out and choose that system.) My understand is that the Chelton/Hoh system is not yet certified on the 407. And If I were them I'd do the 206 first before biting off the 407. The 407 is likely to be a bit of a challenge because of the control responsiveness compared to a 206 or R44.
If it works on the 407, I think the Chelton/Hoh might be a smart buy. As long as you keep in mind its limitations. But until it's certified for the 407, I'm a skeptic when it comes to what people promise in autopilots. Marrying autopilot to airframe is an artform. Just because it works on one model doesn't mean it will perform anywhere near the same on another. I've seen people stuck with a non-working, uncertifiable system and a half disassembled aircraft. (The HAS-promised 427 autopilot based on the 407 SFIM/SAGEM is a classic example of that.)