I used Liquid Wrench to try it out, when I saw it at Wal-Mart. Used it on my storebought, cause I didn't know the effect it would have, and didn't want to ruin my A5.
So glad!
It's a complete piece of junk. When I first put it in, the cube turning was horrible. Extremely gritty. I then let it sit on the counter for a few days, and forgot about it. I came back after about a week or two, and touched it, and it was a little smoother, but nowhere near good lubricants. The lube was gone after a about 3 days of solving, and the cube felt like it was about to break. I never used it again.
It helped the breaking in process, on it, but I would never continue using it. The plastic is so horrendous now, that the cube is a disaster to solve.