I have the blue sensor / red sol-x combo
I like the blue sensor (in the beginning I thought I was going to miss the pink-ish/vermillion tint of my previous cloudy goggles but actually I think its just as good (I didnt fint it "holy shit best lens ever for flat light so much better than anything that came since sliced bread", which is how some people describe it).
I have some issues with the red sol-x exactly on what jaobrien mentioned: If you are in a place where you enter and exit shadowed areas a lot its kind of a pain in bright days. I didnt like that a lot. As the blackout is even darker than the red sol-x, I wonder if it would suffer of a similar problem...
If I ever buy a replacement lens, it will be something a but more in the middle. I always thought that it would be better to have a very high VLT lens paired with a very low VLT lens, but this shadow issue made me think that the situation is not so black and white