I got it for my 07 Plomb GSH City which was faded pretty well in front. It really does deepen the color, but honestly it only lasts for a day or so before it fades back. At least on my bag. I was so excited when I first used it because it made a BIG difference and I thought, "problem solved". Within a day or two it was back to the way it was before. It does not feel greasy at all. It does give a nice shine, too. It seems to be very temporary to me.
Maybe mine is too far faded for the product to have any lasting effect, but I still use it regularly and admire my bag even more when she is in her beautified state!!!!