This is a severe bummer. The 3 concentric ring spinning disc was cool. I don't think a single disc is gonna do it for most buyers after we've all seen the triple disc set-up. If they're gonna change it, I'd rather them go to a triple disc set-up like Whirlwind, where they have 3 separate smaller discs. The Whirlwind set-up seems very reliable, as there are probably still thousands of them that have been working since 1990.