In my personal experience, it's just not that great. But my experience is very limited, and I've only used it on a regular, Rubik's bran cube. That being said, it helpped, but the cube didn't feel that special after. I think Vaseline would work better (I don't recommend using Vaseline), just messier. But yeah, it's not like how I thought it would be. It's not messy, and it leaves a white stain on the cubes, but it doesn't seem to melt them. And you definitely need to make sure you clean the inside of the cube before using CRC.
I haven't had a chance to try Jig-A-Loo, but that might be a better option.
I dunno, though, like I said, I've only used it on a Rubik's brand cube.