Never seen that before...hard for me to think that thing works. That is something for a guy like Luke (liveforphysics) to answer.
As for the Algae Terminator, it does wok, but is not particularly suited for large tanks or in-wall tanks. It cooks the algae killing it, and making it much easier to remove. I have never had good luck with their scraper attachment though, as I always seem to get a piece of sand or something stuck in the groove.
It doesn't save much time in my situation, but it does make it easier from a physical effort stand-point.