So when the lights are doing their full on fruitloop rainbow mode, just dancing through the whole spectrum over and over, they kind of "shimmer", it's like you're looking through high heat, they kind of wiggle up and down. The whole playfield almost seems to be undulating, it's a weird optical illusion.
I wondered if it was the invisiglass, if it is it's not just from one little angle, you can see it easily moving around and from normal playing angles. And it only happens when they do the full RGB spectrum changes, you can't see it during any other lighting modes.
I saw it the other night on Robert Winter's LE too, so it's definitely not just one machine (and the other people in the room see it too, not just me). They were both LEs with invisiglass though.
Anyways, I didn't really care for the effect, it was kinda of unpleasant. Not a big deal, just sort of off putting, and I'd prefer to not have it. Star Trek does nothing of the sort, but I've never seen it with invisiglass to be fair.