Power Factor Corrected.
In Europe and Asia, there is a real push for more efficient electronics. But that should be no surprise, seeing as throughout recent history, Eur-Asia has always been less wasteful... it's why they have 240v and we have 120v... less wire needed. Of course, available resources had a lot to do with it, as well.
The Megawatt, is probably hands down, the best bang for your buck. But it does require the user to be completely hands on. But when gen charging anyway, I don't see the need for automatic charging. And of course, combined with a timer and a pwm controller, one could use it as an automatic charger when plugged in to grid power.