It includes a shaker motor, invisiglass, printed manual, and all the playfield toys. For these reasons alone, yes it's worth the money. And yes, Invisiglass is amazing. Keep it clean (don't remove it with bare hands, or have some Sparkle glass cleaner on hand) and the name is true - it's more or less completely invisible.

Subjectively, the ruby red is beautiful, looks much better than the standard, and should also retain a higher asking price than the standard (though I would never sell mine).

I would recommend seeing what PinballSTAR sells their 75ths for. They tend to have really good prices and fast shipping. I bought my WoZRR from JJP directly and if I were to do it again, I'd go through PinballSTAR.

TLDR: Considering the cost of the bonus features, ignoring everything else, yes it's worth it.

It won't damage it in any way, I just find that marks or oil from hands on invisiglass is WAY more visible than on normal glass. Which is why I keep Sparkle on hand.