I've seen the insides of all three units. Yes, as far as hardware goes, all three are identical. All three units are OEM'ed from Delta, the parent company of Vivitek. The only thing that differs between the three are minor software changes and outside chassis design. The Runco has a better LED modulation implementation (dynamic contrast) over the other two units and it also has a more robust/user friendly color management system.
Thanks! So it sounds like the Runco would be the best of the three. I saw an early review of the vivatek that complained of softness in the picture. Is that true compared to the other two?