This is a good product. It does what it promises. If you never used any kind of lubricant on your guitar, I highly recommend you to do so. It really helps to keep your guitar in tune.
I found this to be too expensive though. I would recommend something like the "Rene Martinez Graphit All Guitar Lube Set" in this case. They are both good products, but as I said, the Rene Martinez is less expensive and also does the job pretty well.