Also, it's a good litmus test - if you absolutely, completely, utterly
hate The Light and can't be persuaded to at least accept it, there's only a very small chance you're going to love anything else. There are differences, I can see someone preferring some of the projects, but there's not going to be an utter revolution for you.
That said, there's still Portnoy - most of the albums with him are worth at least a listen or two, even if you disliked them. Well, apart from the
A Proggy Christmas and the Cover 2 Cov3r ones, I guess.