Scaling - I admit I have no idea what people are talking about here (for either headset). I'd rather not know since I'm not bothered by whatever the issue is, and there is no upside to figuring out something that might bug me.
Er, sorry; but as already mentioned a couple times, at least some of us Vive users perceive our avatar bodies to be about 4 ft tall (1.3 meters or so), and if I turn around and look at the door in a Python, I'd have to duck to get through it (my avatar wouldn't though). On the other hand the console (where the holograms float over) and handholds and such seem larger than they should. I'm unclear if this is the case for ALL vive users, or only some of us, and if its the case on the Rift at all. Its not hugely bothersome, at least to me, though I wonder if its affecting the scaling of planets, stations, and such (and maybe related to the galaxy not appearing to be "infinitely" far away. Maybe Earth is being rendered at the size of Mars, for example.
God Rays - These are a total non-issue for me. I know what they are, and maybe if I look I can see them but they don't but me the slighest on either headset.
I've noticed that if god rays seem excessive or bothersome, its probably because the eyes are not perfectly centered over the lenses. I think this is the case for some other artifacts as well.