One nice advantage of Serial on the Panasonic projectors is that they que commands. If someone turns the projector on, then off quickly, it will wait to go through a full power up cycle before it goes to its cool down. And this works in the reverse, if someone accidentally hits room off, and then tries to turn the projector on, it will do its full cooldown before turning back on again. IR functionality doesn't do this. And the PT AR100 and PT AE7000 do not have IP. Have not played with the 8000 yet tho.