How did it work? I really liked it. For roads like Tail of the Dragon, it's the perfect thing short of a full harness. I also am using it for autocrossing.
I find I like it enough, that I leave it on for my regular daily driving around town.
There is one downside. I am a little more careful about unlatching the belt and flinging it to the side, since it now has 5 ounces of metal attached to it and could mar the inside of the door. It's not that bad as it sounds, but you just don't want to throw the belt open.
We sell it for $34.95 plus shipping. If you can, the best thing is a full 5 point harness. But if you can't, I think the CG-Lock is a very good solution.
We have seen video of the crash testing of a dummy on a sled with and without the CG-Lock. Impressive.