"True heroism is remarkably sober, very undramatic. It is not the urge to surpass all others at whatever cost, but the urge to serve others at whatever cost." -Arthur Ashe
I just looked at them at SHOT. I think they said they would have slightly decreased performance compared to the existing PLH/OKW (which makes sense given the limits of CR123As). They do have existing heads that are dual fuel for their standard body threads (same as SF Dual Fuel Scout), the Legacy models are just for the older Scout/E Series threads.
For a handheld, I still greatly prefer the Malkoff 1" heads because they are way more comfortable in a pocket. I've never found any of the 1.2"+ light heads to be comfortable for pocket carry.