The Chuck obviously has some sort of electronic regulation which makes it distinctly different than the Prodigy. It's probably some sort of "pulsed" regulation, so I assume it wouldn't increase runtime like a "true" regulator would. I suggested a long time ago that Steve look into true regulation for a future product - advantage is you're not throwing away voltage as heat so runtime increases. But whether it would be enough to matter I don't know.
Another positive aspect of regulation is it could be setup so the user could choose his output, but the only devices I've seen like that used PMW or something so back to no increase in runtime. Cool to be able to dial in just what you wanted for output though.